1
NEET 2013
MCQ (Single Correct Answer)
+4
-1
A plano convex lens fits exactly into a plano concave lens. Their plane surfaces are parallel to each other. If lenses are made of different materials of refractive indices $$\mu$$1 and $$\mu$$2 and R is the radius of curvature of the curved surface of the lenses, then the focal length of the combination is
A
$${R \over {\left( {{\mu _1} - {\mu _2}} \right)}}$$
B
$${{2R} \over {\left( {{\mu _2} - {\mu _1}} \right)}}$$
C
$${R \over {2\left( {{\mu _1} + {\mu _2}} \right)}}$$
D
$${R \over {2\left( {{\mu _1} - {\mu _2}} \right)}}$$
2
NEET 2013
MCQ (Single Correct Answer)
+4
-1
For a normal eye, the cornea of eye provides a converging power of 40 D and the least converging power of the eye lens behinf the cornea is 20 D. Using this information, the distance between the retina and the cornea-eye lens can be estimated to be
A
1.67 cm
B
1.5 cm
C
5 cm
D
2.5 cm
3
AIPMT 2012 Mains
MCQ (Single Correct Answer)
+4
-1
For the angle of minimum deviation of a prism to be equal to its refracting angle, the prism must be made of a material whose refractive index.
A
lies between $$\sqrt 2$$ and 1
B
lies between 2 and $$\sqrt 2$$
C
is less than 1
D
is greater than 2
4
AIPMT 2012 Mains
MCQ (Single Correct Answer)
+4
-1
A rod of length 10 cm lies along the principal axis of a concave mirror of focal length 10 cm in such a way that its enf closer to the pole is 20 cm away from the mirror. The length of the image is
A
10 cm
B
15 cm
C
2.5 cm
D
5 cm
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