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Geometrical Optics question

2012 · Q142
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Geometrical Optics question

2012 · Q142

NEETPhysicsGeometrical OpticsMCQ+4 / −1
A concave mirror of focal length fff1 is placed at a distance of d from a convex lens of focal length fff2. A beam of light coming from infinity and falling on this convex lens −-− concave mirror combination returns to infinity. The distance d must equal
  1. A
    f1+f2{f_1} + {f_2}f1​+f2​
  2. B
    −-−f1+f2{f_1} + {f_2}f1​+f2​
  3. C
    2f1+f2{f_1} + {f_2}f1​+f2​
  4. D
    −-−2f1+f2{f_1} + {f_2}f1​+f2​
View written solutionFree

Correct answer: C

AIPMT 2012 Prelims Physics - Geometrical Optics Question 59 English Explanation


$ \therefore $ d = 2f1 + f2
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