# Objective questions of ray optics

this assignment will provide the important Objective questions of ray optics for  students preparing for class-12th board examination and for the students preparing for JEE/NEET and other competitive examinations.

Reflection and Refraction of Light at Plane Surface ( Objective questions of ray optics)

1. When light travels from glass to air, the incident angle is and the refraction angle is .the true relation is :(a)θ 12      (b)  θ 1 (c)θ1 (d)Not predictable
2. Two mirrors are kept at 60 to each other and a body is placed in the middle.The total number of images formed is:(a)Three(b)Four (c)Five (d)Six
3. If an object is placed unsymmetrically between two plane mirrors inclined at an angle 72 ,then the total number of images formed is:(a)5   (b)4    (c)2   (d)infinite
4. If an object is placed symmetrically between two plane mirrors, inclined at an angle of 72 .than the total total number of images formed is:(a)5 (b)4 (c)2 (d)Infinite

5) A ray of light is incident on a plane mirror at an angle of incidence of 30⁰ ,the deviation

Produced by the mirror is :

(a) 30 ⁰ ( b) 60⁰

(c) 90⁰ (d) 120

6) when a ray of light enters a glass slab from air:

(a) its wavelength decreases

(b) its wavelength decreases

(c) its frequency increases

(d) neither wavelength nor frequency changes

7) When a light enters from air to water, then its:

(a) frequency increases and speed decreases

(b) frequency is the same but the wavelength is smaller in water then in air:

(c) frequency is same but wavelength in water is greater than in air