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QAIPM-2012-Ph-1667: NEET 2012 Physics - Class 12 AIPM-2012-Ph-1667 Solution: A rod of length 10 cm lies along the principal axis of a…
A rod of length 10 cm lies along the principal axis of a concave mirror of focal length 10 cm in such a way that its end closer to the pole is 20 cm away from the mirror. The length of the image is 10 cm 15 cm 2.5 cm 5 cm
Multiple Choice Options
- A 10 cm
- B 15 cm
- C 2.5 cm
- D 5 cm
Step-by-Step Verified Solution
Image position of end A
1 v A + 1 _ 20 = 1 _ 10
_ v A = - 20 cm
Image position of the end B
1 v B + 1 _ 30 = 1 _ 10
_ v B = -15 cm
Length of the image is
L A'B' = |v A | - |v B | = 20 - 15 = 5 cm