1.
A convex lens is also known as:
A
Diverging lens
B
Converging lens
C
Plane lens
D
Negative lens
2.
Which objects commonly act as gravitational lenses?
A
Mirrors
B
Glass slabs
C
Stars and galaxies
D
Prisms
3.
The bending of light around sharp edges is called:
A
Reflection
B
Refraction
C
Diffraction
D
Dispersion
4.
Acoustic lenses are mainly used in:
A
Photography
B
Medical ultrasonography
C
Optical microscopes
D
Astronomy
5.
The splitting of white light into its component colors is called:
A
Reflection
B
Refraction
C
Diffraction
D
Dispersion
6.
Which quantity remains constant when light travels from air into glass?
A
Speed
B
Wavelength
C
Frequency
D
Direction
7.
The angle between the incident ray and the normal is called:
A
Angle of reflection
B
Angle of deviation
C
Angle of incidence
D
Critical angle
8.
Rods in the human eye are sensitive to:
A
Color
B
Bright light
C
Dim light
D
Ultraviolet light
9.
Gravitational lensing provides evidence for:
A
Wave nature of light
B
Quantum theory
C
General theory of relativity
D
Atomic structure
10.
Hypermetropia is corrected using:
A
Concave lens
B
Convex lens
C
Plane mirror
D
Prism
11.
Which optical device uses total internal reflection to change the direction of light?
A
Lens
B
Plane mirror
C
Prism
D
Magnifying glass
12.
Gravitational lensing occurs due to:
A
Strong electric fields
B
Magnetic fields
C
Gravitational fields of massive objects
D
Atmospheric refraction
13.
Acoustic lenses are used to focus:
A
Light waves
B
Radio waves
C
Sound waves
D
Heat waves
14.
The angle between the reflected ray and the normal is called:
A
Angle of incidence
B
Angle of refraction
C
Angle of reflection
D
Critical angle
15.
Snell’s law relates the angles of incidence and refraction with:
A
Speed of light
B
Wavelength of light
C
Refractive indices
D
Intensity of light
16.
The unit of focal length is:
A
Dioptre
B
Meter
C
Watt
D
Second
17.
The phenomenon of bending of light when it passes from one medium to another is called:
A
Reflection
B
Diffraction
C
Refraction
D
Dispersion
18.
Which lens is used to correct myopia (short-sightedness)?
A
Convex lens
B
Concave lens
C
Bifocal lens
D
Cylindrical lens
19.
Which color has the shortest wavelength in the visible spectrum?
A
Red
B
Green
C
Blue
D
Violet
20.
The power of a lens is measured in:
A
Watt
B
Dioptre
C
Meter
D
Candela