Questions
A point object is placed at a distance of 25 cm from a convex lens of focal length 20 cm. If a glass slab of thickness t and refractive index 1.5 is inserted between the lens and the object, the image is formed at infinity. The thickness t is
detailed solution
Correct option is D
For the image to form at infinity the object must be at focus of the lens and hence the shift is 25 - 20=5 cm. We know 5=t1−23⇒t=15cmTalk to our academic expert!
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A vessel is half filled with a liquid of refractive index μ. The other half of the vessel is filled with an immiscible liquid of refractive index 1.5 μ. The apparent depth of vessel is 50% of the actual depth. The value of μ is
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