| A convex lens, of focal length 30cm, 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: [JEE ONLINE 09-04-2016] |
 |
| Focal length| |Focal length| |
| = 30 cm =120 cm |
 |
A) 70 cm from the concave lens
B) 60 cm from the convex lens
C) 60 cm from the concave lens
D) None of these
Correct Answer: D
Solution :
[BONUS]   |
 |
| Event - 1 Refraction from convex lens. |
| F = + 30 |
 |
  |
| Event - 2 Refraction from concave lens |
 |
 |
| Event - 3 Refraction from plane mirror |
 |
| Event - 4 Refraction from concave lens |
 |
 |
 |
| Event - 5 Refraction from convex lens |
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