Video Lecture
Theory For Notes Making
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Objective Assignment
Q.1
A thin convergent glass lens (mg = 1.5) has a power of +5.0 D. when this lens is immersed in a liquid of refractive index ml, it acts as a divergent lens of focal length 100 cm. The value of ml is
(a) 4/3 (b) 5/3 (c) 5/4 (d) 6/5
Ans. (b)
Q.2
Focal length of an equiconvex lens is 20 cm. If we cut it once perpendicular to principle axis, and then along principle axis. Then focal length of each part will be
(a) 20 cm (b) 10 cm (c) 40 cm (d) 5 cm
Ans. (c)
Q.3
A liquid of refractive index 1.33 is placed between two identical plano-convex lenses, with refractive index 1.50. Two possible arrangements, P and Q are shown. The system is
(a) divergent in P , convergent in Q
(b) convergent in P, divergent in Q
(c) convergent in both
(d) divergent in both
Ans. (c)
Subjective Assignment
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