science
Grade-7
Easy
Question
A ray of light crosses a glass slab. At the air-glass interface, the angle of refraction is 45 degrees. The angle incidence at the glass-air interface is ___ degrees.
Hint:
Glass slab follows a particular law.
The correct answer is: 45
A ray of light crosses a glass slab. At the air-glass interface, the angle of refraction is 45 degrees. The angle incidence at the glass-air interface is 45 degrees.
The ray of light travels from a rarer medium to denser medium that is from air to glass and then again from glass to air. This causes a lateral shift due to which the angle of incidence becomes equal to angle of emergence and also becomes parallel.
Hence, 45 degrees is the answer as angle of incidence= angle of emergence (only for glass slab).
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