Question

Which of the following produces diffuse reflection of light?
A. mirror on a dressing table
B. water surface of a pond
C. screen in a cinema hall
D. polished wooden table

Answer 1

Answer:

water surface of a pond

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Answer 2

C. Screen in a cinema hall produces diffuse reflection of light.

Explanation:

• When light incidence on smooth surface, the light is reflected in one direction as parallel beam. This is why our eyes cannot view the reflection from mirror, water and polished wood directly.
• When the light incidence on rough surface, the light is reflected in many direction.
• So in cinema hall, the screen is designed as rough and irregular surface.
• In theatre, the projector projects parallel light rays which falls on screen. Due to irregularity of screen, the light is reflected in different direction.
• This phenomenon of reflection helps people from anywhere in the theatre to see the picture projected by the projector.