1

Snell’s law relates the angles of incidence and refraction with:

2

The bending of light around sharp edges is called:

3

Which material is commonly used to make acoustic lenses?

4

The unit of focal length is:

5

The phenomenon of bending of light when it passes from one medium to another is called:

6

Which color has the longest wavelength?

7

Which color has the shortest wavelength in the visible spectrum?

8

The minimum angle of incidence for which total internal reflection occurs is called:

9

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

10

Which phenomenon explains the formation of a rainbow?

11

Which quantity remains constant when light travels from air into glass?

12

Which objects commonly act as gravitational lenses?

13

Total internal reflection occurs when light travels from:

14

Gravitational lensing provides evidence for:

15

Gravitational lensing occurs due to:

16

Which cells in the retina are responsible for color vision?

17

Which color deviates the most when passing through a prism?

18

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

19

The refractive index of a medium depends upon:

20

The focal length of a concave lens is taken as:

21

The power of a lens is measured in:

22

Optical fibers work on the principle of:

23

Which lens is thicker at the center than at the edges?

24

Which type of mirror always forms a virtual, erect, and diminished image?

25

Which optical device uses total internal reflection to change the direction of light?