Refraction Of Light

Question 1

What is refraction of light?

Answer 1

The change in direction of light as it travels from one medium to another. (due to its varying wavelengths in these media)

Question 2

What are the laws of refraction?

Answer 2

1. Incident ray, the normal to the point of incidence at the interface, and the refracted ray all lie on the same plane.
2. For two given media, the ratio of the sin of the incident ray to the sin of the refracted ray is constant.

Question 3

What is the formula for refractive index with respect to two media

Answer 3

N1(sin∅) = n2(sin∅)

Question 4

What is a converging lens?

Answer 4

Convex lens

A converging lens converges all parallel rays of light passing through it to a real focus.

Question 5

What is a diverging lens?

Answer 5

Concave lens.

It diverges all parallel rays of light away from a (virtual?) focus.

Question 6

For convex lens, when an object is placed before focal point ‘F’

Answer 6

Image is real and inverted.

Question 7

For convex lens, when an object is placed ahead of focal point ‘F’…?

Answer 7

Image is virtual and erect

Question 8

For concave lens, when an object is placed before focal point ‘F’

Answer 8

Image is (always) virtual, erect, and diminished.

Question 9

For concave lens, when an object is placed ahead of focal point ‘F’

Answer 9

Image is (always) virtual, erect, and diminished.