The position of fish in a pond is not same as it is observed from outside. Why? Explain with diagram.

When light enters from rarer medium to denser medium, light ray bends towards normal, and when it passes from denser to rarer medium it bends away from the normal. When we observe a fish in a water from outside it appears above than its actual position due to refraction. Suppose that a fish is at depth AP = H inside water. At point Q , light rays travel from,denser medium (water) to rarer medium (air) and hence are refracted away from normal NN'. Therefore, image of P forms at P'. This is the reason why the Apparent depth of fish AP ' = h is lower than the Real depth and fish seems to be upraised. Relation between Apparent depth and real depth is expressed using refractive index as Refractive index μ = Real depth Apparent depth = H h

When any empty test-tube is submerged inclinely in a water filled beaker, its surface appears silvery shining. Why? Explain with diagram.

An empty test tube (air medium) inclined at some angle is immersed in beaker filled with water, when it is observed from top, the upper part of test tube looks shiny as it has been painted. The reason behind this is that when light ray travelling through water incident on test tube, the rays travels from rarer to denser medium. This is followed by light travelling from the glass wall of test tube towards glass-air boundary, in which some of the rays have angle of incidence greater than critical angle. Therefore, these rays reach eyes after total internal reflection and hence the upper part of test tube looks as shiny as silver. The shininess disappears as the test tube is filled with water.

What is reflection of light? Write law of reflection and draw labelled diagram.

Reflection is the phenomenon of bouncing back of light from the surface into the same medium. There are two laws of reflection. Angle of incidence is always equal to the angle of reflection. Incident ray, normal and the reflected ray lie in the same plane. i = Angle of incidence r = Angle of reflection These laws of reflection are valid for all reflecting surfaces including spherical surfaces.

E M B I B E

EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR SCIENCE>Chapter 10 - Light: Reflection and Refraction from Plane Surface>Chattisgarh Board-2020>Q 6

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10th Chhattisgarh Board

IMPORTANT

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Write any three uses of plane mirror.

Important Questions on Light: Reflection and Refraction from Plane Surface

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10th Chhattisgarh Board

IMPORTANT

EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR SCIENCE>Chapter 10 - Light: Reflection and Refraction from Plane Surface>Chattisgarh Board-2020>Q 7

Light enters from air to glass plate having $1.50$ refractive index. What is the speed of light in glass? (Given-speed of light in vacuum $3 \times 10^{8} m s^{- 1}$ )

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10th Chhattisgarh Board

IMPORTANT

EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR SCIENCE>Chapter 10 - Light: Reflection and Refraction from Plane Surface>Chattisgarh Board-2020>Q 8

A fish seems to be at the depth of $75 cm$ from the surface of a pond, then find out its actual depth from the surface. (Given-refractive index of water $\frac{4}{3}$ )

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