Question

When light ray is reflected
a) frequency remains same
b) Velocity will decrease
c)wave length will remain same
d) both a and c​

Answer 1

Answer:

d.

Explanation:

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Answer 2

Answer:

d) both a and c

EXPLANATION:    

When light is refracted into a medium its speed changes but the frequency remains the same because the energy associated with a photon of this light is proportional to the frequency of the light and it remains unchanged. Since the wavelength λ = c/, i.e. λ ∝ c. So the wavelength changes. Option d is true.