TS EAMCET · Physics · Ray Optics
A convex lens focusses an object from it on a screen placed away from it. A glass plate (refractive index ) of thickness is inserted between the lens and the screen. What is the distance of the object from the lens, so that its image is again focused on the screen?
- A
- B
- C
- D
Answer & Solution
Correct Answer
(B)
Step-by-step Solution
Detailed explanation
Apparent shift in position due to a glass slab is given by d=t1-1μ. ⇒d=1.41-57=0.4 cm For refraction without glass slab, u=-20 cm, v=5 cm. Applying lens equation, 1f=1v-1u=15+120⇒f=4 cm For refraction with glass slab inserted,…
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