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Question

A pin is placed 10 cm in front of a convex lens of focal length 20 cm and refractive index 1.5. The surface of the lens farther away from the pin is silvered and has a radius of curvature of 22 cm. How far from the lens is the final image formed?

A
10cm
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B
11cm
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C
12cm
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D
13cm
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Solution

The correct option is B 11cm
The vet focus of systom fnt
Q we Rusus
1vet =2fe+1fm
as Rm=22conf=222=12 cm
yfn+1=220+111110+11111+10110
fmet=110 cm
by mirror formula 1y+141f
1y+1(10)=11101v=1110+110
1v=10+11011001001100=111v=11 cm
Wenee option B is corvect
the final imbge is formed 11 cm from the lens.

2001707_1277456_ans_8fa758ba279c43cf99812ac34674a7c8.PNG

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