10th Physics Chapter 3: Geometrical Optics

Sr #	Questions	A	B	C	D
1	The power of a lens is measured in:	Diopters	Watts	Newtons	Meters
2	According to the laws of reflection, the angle of incidence is equal to the angle of:	Absorption	Transmission	Reflection	Refraction
3	Which of the following conditions must be met for total internal reflection to occur?	Light must pass from a denser medium to a rarer medium	The angle of incidence must be greater than the angle of refraction	The angle of incidence must be greater than the critical angle	The medium must be transparent
4	What type of lens causes parallel rays of light to converge at a point?	Convex lens	Concave lens	Biconvex lens	Biconcave lens
5	The angle by which a ray of light is bent when passing through a lens is called:	Refraction angle	Reflection angle	Deviation angle	Incidence angle
6	The equation for calculating the critical angle is:	n = sin(c)	n = cos(c)	n = tan(c)	n = csc(c)
7	A convex mirror can be used as:	A makeup mirror	A solar cooker	A shaving mirror	A telescope mirror
8	What is the first law of reflection?	The incident ray, the reflected ray, and the normal to the surface at the point of incidence, all lie in the same plane.	The angle of incidence is equal to the angle of reflection.	Light travels in straight lines.	The angle of incidence is greater than the angle of reflection.
9	What happens to the size of the image formed by a concave mirror if the object is placed beyond the center of curvature?	The size of the image decreases	The size of the image increases	The size of the image remains the same	The size of the image becomes zero
10	The resolving power of a lens is its ability to:	Magnify distant objects	Produce clear and distinct images of nearby objects	Focus light rays	Diverge light rays
11	Short-sightedness, or myopia, is corrected by using:	Convex lenses	Concave lenses	Cylindrical lenses	Bifocal lenses
12	What is the principal focus of a concave mirror?	The point where the reflected rays converge after reflection	The point where the incident rays converge before reflection	The center of curvature of the mirror	The point where the mirror surface meets the principal axis
13	What is the purpose of the cladding in an optical fiber?	To increase the refractive index	To protect the core from damage	To allow light to escape through the core	To decrease the critical angle
14	What is the critical angle?	The angle at which light bends while passing from one medium to another	The angle at which total internal reflection occurs	The angle at which light travels in a straight line	The angle at which light is refracted
15	Which color of light deviates the most when passing through a prism?	Red	Green	Blue	Violet
16	Which of the following statements about convex mirrors is true?	They always produce real and inverted images.	They always produce virtual and erect images.	They always produce virtual and inverted images.	They always produce real and erect images.
17	Practical lenses are commonly used in:	Eyeglasses	Microscopes	Telescopes	All of the above
18	A convex lens is used to correct which of the following vision problems?	Nearsightedness	Farsightedness	Astigmatism	Cataracts
19	Which of the following statements about optical fibers is true?	They work by total external reflection	They allow light to escape through the core	They are only used for short-distance communication	They have a low refractive index
20	When light passes through a prism, it undergoes:	Reflection	Refraction	Diffraction	Interference
21	Optical fibers work based on the principle of:	Reflection	Refraction	Diffraction	Interference
22	Which of the following conditions must be met for total internal reflection to occur?	Light must pass from a denser medium to a rarer medium	Light must pass from a denser medium to a rarer medium	The angle of incidence is greater than the critical angle	The angle of incidence is less than the critical angle
23	When light passes through a convex lens, the image formed is:	Real and inverted	Virtual and inverted	Real and erect	Virtual and erect
24	In a photo camera, which type of lens is used to adjust the focus and zoom?	Convex lens	Concave lens	Cylindrical lens	Zoom lens
25	Snell’s Law describes the relationship between the angles of incidence and refraction when light passes through a boundary between two different:	Colors	Media	Wavelengths	Frequencies
26	What is the critical angle for a medium with a refractive index of 1.5?	30 degrees	45 degrees	60 degrees	90 degrees
27	When light enters a denser medium from a rarer medium, it bends:	Away from the normal	Towards the normal	Along the normal	At right angles to the normal
28	Total internal reflection occurs when:	Light passes from a denser medium to a rarer medium	Light passes from a rarer medium to a denser medium	The angle of incidence is greater than the critical angle	The angle of incidence is less than the critical angle
29	What is the main advantage of using optical fibers for communication?	They are cheaper than other communication cables	They are easier to install	They can transmit data at higher speeds	They are less prone to interference
30	When white light passes through a prism, it separates into its constituent colors. This phenomenon is known as:	Reflection	Refraction	Dispersion	Diffraction
31	What is the spherical mirror equation used for?	To calculate the focal length of a mirror	To determine the size of an image formed by a mirror	To find the magnification produced by a mirror	To measure the radius of curvature of a mirror
32	Refraction of light occurs when light passes from one medium to another and:	Changes speed	Changes color	Changes direction	Changes intensity
33	Which of the following is an application of lenses?	Correcting vision problems	Filtering light	Transmitting radio waves	Generating electricity
34	If an object is placed between the principal focus and the pole of a concave mirror, the image formed will be:	Real and inverted	Virtual and erect	Real and erect	Virtual and inverted
35	What happens to the deviation of light passing through a lens if the incident angle increases?	The deviation increases	The deviation decreases	The deviation remains the same	The deviation becomes zero
36	Which of the following lenses causes parallel rays of light to diverge?	Convex lens	Concave lens	Biconvex lens	Biconcave lens
37	The process of separating white light into its constituent colors is due to differences in the __________ of different colors of light.	Speed	Wavelength	Frequency	Amplitude
38	A simple microscope consists of a:	Single lens	Multiple lenses	Concave lens	Convex lens
39	The angle by which a ray of light is bent when it passes through a prism is called:	Refraction angle	Reflection angle	Deviation angle	Incidence angle
40	The refractive index of water is approximately:	1.33	2.45	0.75	3.00
41	A convex mirror is commonly used in shopping malls for:	Enhancing security	Providing decorative effects	Helping customers see around corners	Reflecting light evenly across the store
42	The magnifying power of a lens is determined by its:	Focal length	Refractive index	Thickness	Diameter
43	In an optical fiber, the core is made of:	Glass	Plastic	Metal	Air
44	When light bounces off a surface, it is called:	Refraction	Reflection	Diffraction	Dispersion
45	Which type of mirror is used in a shaving mirror?	Concave mirror	Convex mirror	Plane mirror	Spherical mirror
46	Long-sightedness, or hyperopia, is corrected by using:	Convex lenses	Concave lenses	Cylindrical lenses	Bifocal lenses
47	The speed of light in glass is generally	Slower than the speed of light in vacuum	Faster than the speed of light in vacuum	Equal to the speed of light in vacuum	Unpredictable
48	What is the refractive index of a medium?	The ratio of the speed of light in vacuum to its speed in the medium	The ratio of the speed of light in the medium to its speed in vacuum	The angle of deviation of light passing through the medium	The angle of incidence of light passing through the medium
49	The distance between the principal focus and the pole of a mirror is called:	Focal length	Radius of curvature	Diameter	Magnification
50	Image formation in the human eye is primarily due to the:	Cornea	Retina	Iris	Pupil
51	The speed of light in diamond is significantly slower than in glass due to:	Higher density	Lower density	Higher refractive index	Lower refractive index
52	What does the lens equation determine?	The magnification of the lens	The focal length of the lens	The power of the lens	The refractive index of the lens