20. Assertion (A): When a light ray travels from air to glass, the angle of incidence is less than the angle of refraction. Reason (R): Light rays bend towards the normal while entering a denser medium from a rarer medium I hmer to Un 21. Assertion (A): The image produced by a concave lens cannot be obtained on a screen. Reason (R): Concave lenses diverge light rays falling on it.
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