JEE Main 2016 — Ray Optics Question with Solution
JEE Main 2016 (09 Apr Online)
Question
A convex lens, of focal length 30 cm, a concave lens of focal length 120 cm, and a plane mirror are arranged as shown. For an object kept at a distance of 60 cm from the convex lens, the final image, formed by the combination, is a real image, at a distance of:
Choose an option
Show full solutionCorrect option: A
Correct answer
A60 cm from the convex lens
Step-by-step explanation
From lens formula for convex lens, we have
Applying lens formula to concave lens, we have
Virtual object 10 cm behind plane mirror.
Hence real image 10 cm in front of mirror.
Hence 60 cm from convex lens.
Applying lens formula to concave lens, we have
Virtual object 10 cm behind plane mirror.
Hence real image 10 cm in front of mirror.
Hence 60 cm from convex lens.
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