NEET 2013 | Geometrical Optics Question 46 | Physics

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

$${R \over {\left( {{\mu _1} - {\mu _2}} \right)}}$$

$${{2R} \over {\left( {{\mu _2} - {\mu _1}} \right)}}$$

$${R \over {2\left( {{\mu _1} + {\mu _2}} \right)}}$$

$${R \over {2\left( {{\mu _1} - {\mu _2}} \right)}}$$

AIPMT 2012 Mains

MCQ (Single Correct Answer)

-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

10 cm

15 cm

2.5 cm

5 cm

AIPMT 2012 Mains

MCQ (Single Correct Answer)

-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.

lies between $$\sqrt 2 $$ and 1

lies between 2 and $$\sqrt 2 $$

is less than 1

is greater than 2

AIPMT 2012 Prelims

MCQ (Single Correct Answer)

-1

The magnifying power of a telescope is 9. When it is adjusted for parallel rays the distance between the objective and eyepiece is 20 cm. The focal length of lenses are

10 cm, 10 cm

15 cm, 5 cm

18 cm, 2 cm

11 cm, 9 cm

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