1
AIPMT 2012 Prelims
MCQ (Single Correct Answer)
+4
-1
Change Language
A concave mirror of focal length $$f$$1 is placed at a distance of d from a convex lens of focal length $$f$$2. A beam of light coming from infinity and falling on this convex lens $$-$$ concave mirror combination returns to infinity. The distance d must equal
A
$${f_1} + {f_2}$$
B
$$-$$$${f_1} + {f_2}$$
C
2$${f_1} + {f_2}$$
D
$$-$$2$${f_1} + {f_2}$$
2
AIPMT 2012 Prelims
MCQ (Single Correct Answer)
+4
-1
Change Language
A ray of light is incident at an angle of incidence i, on one face of a prism of angle A (assumed to be small ) and emerges normally from the opposite face. If the refractive index of the prism is $$\mu $$. the angle of incidence i, is nearly equal to
A
$$\mu $$A
B
$${{\mu A} \over 2}$$
C
$${A \over \mu }$$
D
$${A \over {2\mu }}$$
3
AIPMT 2012 Prelims
MCQ (Single Correct Answer)
+4
-1
Change Language
When a biconvex lens of glass having refractive index 1.47 is dipped in a liquid, it acts as a plane sheet of glass. This implies that the liquid must have refractive index
A
equal to that of glass
B
less than one
C
greater than that of glass
D
less than that of glass
4
AIPMT 2011 Mains
MCQ (Single Correct Answer)
+4
-1
A converging beam of rays is incident on a diverging lens. Having passed through the lens the rays intersect at a point 15 cm from the lens on the opposite side. If the lens is removed the point where the rays meet will move 5 cm closer to the lens. The focal length of the lens is
A
5 cm
B
$$-$$ 10 cm
C
20 cm
D
$$-$$ 30 cm
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