NEET Physics: Optics

Question 1

The refractive index of a medium is defined as:

Accepted Answer

Speed of light in vacuum / Speed of light in medium

Question 2

A convex lens with focal length 20 cm forms a real image. The image distance for an object at 30 cm is:

Accepted Answer

60 cm

Question 3

Total internal reflection occurs when light travels from:

Accepted Answer

Denser to rarer medium beyond critical angle

Question 4

Which colour of light has the highest frequency?

Accepted Answer

Violet