Question

ASSERTION-Pencil immersed partly in water appears to be bent

REASON-When light travels from air into water, it slows down, causing it to change direction

slightly. This is called refraction.​

Answer 1

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Assertion: When a pencil is partly immersed in water and held obliquely to the surface, the pencil appears to bend at the water surface. Reason: The apparent bending of the pencil is due to the refraction of light when it passes from water to air

Change of speed causes change of direction

How much does light bend?

When light travels from air into water, it slows down, causing it to change direction slightly. This change of direction is called refraction. When light enters a more dense substance (higher refractive index), it 'bends' more towards the normal line.