A person can see clearly object only when they lie between 50 cm and 400 cm from his eyes. In order to increase the maximum distance of distinct vision to infinity, the type and power of the correcting lens, the person has to use, will be

Question:

Options :

(a) convex, +0.15D
(b) convex, +2.25D
(c) concave, -0.25D
(d) concave, -0.2D

Answer :

Answer Steps :

step 1

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Forty electric bulbs are connected in series across a 220 V supply. After one bulb is fused, the remaining 39 are connected again in series across the same supply. The illumination will be

If a body is executing simple harmonic motion then

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