Optics Question 815

Question: Convex surface of thin concavo-convex lens of refractive index 1.5 is silvered as shown. A small object is kept in air at 30 cm left of the lens on its principal axis. The distance of the final image is

Options:

A) 20cm

B) 30cm

C) 10cm

D) 15cm

Show Answer

Answer:

Correct Answer: C

Solution:

[c] Power of combinations P=2(μ1)(160120)+(120/2)

P=215=1f

Resultant focal length f=152

From mirror formula 130+1v=1f Solving v=10cm.



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