Unit 14: Optics + Unit 15: Electrostatics

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1. Which formula relates focal length, image distance, and object distance of a lens?

A Magnification formula

B Lens maker’s formula

C Lens formula

D Mirror formula

2. Acoustic lenses are used to focus:

A Light waves

B Radio waves

C Sound waves

D Heat waves

3. Optical fibers work on the principle of:

A Reflection

B Refraction

C Total internal reflection

D Dispersion

4. In a convex lens, parallel rays of light after refraction meet at:

A Center of curvature

B Optical center

C Principal focus

D Pole

5. Which lens is used to correct myopia (short-sightedness)?

A Convex lens

B Concave lens

C Bifocal lens

D Cylindrical lens

6. A convex lens is also known as:

A Diverging lens

B Converging lens

C Plane lens

D Negative lens

7. Which application uses corona discharge?

A Photocopiers

B Electric heaters

C Motors

D Generators

8. Which factor does electric field strength depend on?

A Charge only

B Distance only

C Charge and distance

D Mass

9. Which law of reflection states that the angle of incidence is equal to the angle of reflection?

A First law of reflection

B Second law of reflection

C Law of refraction

D Snell’s law

10. Which color has the shortest wavelength in the visible spectrum?

A Red

B Green

C Blue

D Violet

Unit 14: Optics + Unit 15: Electrostatics

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