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10. Light-Reflection and Refraction
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Q22 of 36 Page 283

Which property of concave mirror is utilized for using them as shaving mirrors?

The property of concave mirror to magnify the image of object is utilized for using them as shaving mirrors.

Concave mirrors are used as shaving mirrors to see enlarged image of the face and make the shave. When the face is held within the focus of a concave mirror then the enlarged image can be seen in the concave mirror.



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20

The image formed by spherical mirror is real, inverted and is of magnification-2. If the image is at a distance of 30 cm from the mirror, where is the object placed? Find the focal length of the mirror. List two characteristics of the image formed if the object is moved 10 cm towards the mirror.

21

The refraction index of a medium ‘X’ with respect to medium ‘Y’ is 2/3 and the refractive index of medium ‘Y’ with respect to medium ‘Z’ is 4/3. Find the refractive index of medium ‘Z’ with respect to medium ‘X’.

22

Light passes through a rectangular glass slab and through a triangular glass prism. Using proper ray diagram, explain in what way does the direction of the two emergent beams differs with respect to the incident beam of light.

22

A concave lens has a focal length of 50 cm Calculate its power.

Questions · 36
10. Light-Reflection and Refraction
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