1
AIPMT 2015 Cancelled Paper
MCQ (Single Correct Answer)
+4
-1
Two identical thin plano-convex glass lenses (refractive index 1.5) each having radius of curvature of 20 cm are placed with their convex surfaces in contact at the centre. The intervening space is filled with oil of refractive index 1.7. The focal length of the combination is
A
$$-$$ 50 cm
B
50 cm
C
$$-$$ 20 cm
D
$$-$$ 25 cm
2
AIPMT 2014
MCQ (Single Correct Answer)
+4
-1
The angle of a prism is A. One of its refracting surfaces is silvered. Light rays falling at an angle of incidence 2 A on the first surface returns back through the same path after suffering reflection at the silvered surface.

The refractive index $$\mu $$, of the prism is
A
2sinA
B
2cosA
C
$${1 \over 2}$$cosA
D
tanA
3
AIPMT 2014
MCQ (Single Correct Answer)
+4
-1
If the focal length of objective lens is increased then magnifying power of
A
microscope will increase but that of telescope decrease.
B
microscope and telescope both will increase.
C
microscope and telescope both will decrease.
D
microscope will decrease but that of telescope will increase.
4
NEET 2013 (Karnataka)
MCQ (Single Correct Answer)
+4
-1
Two plane mirrors are inclined at 70o. A ray incident on one mirror at angle, $$\theta $$ after reflection falls on second mirror and is reflected from there parallel to first mirror. The value of $$\theta $$ is
A
45o
B
30o
C
55o
D
50o
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