Light - Study Mode

[#216] If the refractive index of water is $$frac{4}{3}$$, what will be the speed of light in water?
Correct Answer

(A) 2.25 × 10 8 m/s

[#217] If the focal length of a mirror is +15, it is:
Correct Answer

(C) convex mirror

[#218] Which one of the following lenses should be used to correct the defect of astigmatism?
Correct Answer

(A) Cylindrical lens

[#219] Which of the following angles are equal in case of plane mirror? 1. Angle of incidence 2. Angle of refraction 3. Angle of reflection
Correct Answer

(B) Only 1 and 3

[#220] The colour of an opaque object is due to the colour it
Correct Answer

(C) Reflects