Parallel rays of Sun fall upon a concave lens of 10cm focal length at a distance of 20cm from this lens a convex lens of 15 CM focal length is a place where should the lens we place to get the image of the Sun
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Explanation:
Given that,
Focal length f=15cm
Distance of the image v=−10cm
We know that,
f
1
=
v
1
−
u
1
−15
1
=
−10
1
−
u
1
−
u
1
=
−15
1
+
10
1
−
u
1
=
30
1
u=−30cm
Hence, the object is placed 30 cm away from the concave lans
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