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Revision Quiz on Geometrical Optics - I

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Question 1

Rob drops lens of glass of refractive index 1.5 having power of +2.5 D into liquid of refractive index 1.67. What will be the change in the power of the lens?

Question 2

A point source of light is placed at from a converging lens of focal length f. A flat mirror is placed on the other side of the lens at a distance d such that rays reflected from the mirror are parallel after passing through the lens again. If cm, then d (in cm) is equal to

Question 3

In a compound microscope, the objective and the eyepiece have the focal length of 0.95 cm and 2 cm respectively and are kept at the distance of 10 from the eye. Find the position of the object.

Question 4

The telescopes with mirror objectives are called

Question 5

The focal lengths of objective lens and eye lens of a Gallelian Telescope are respectively 30 cm and 3.0 cm. Telescope produces virtual, erect image of an object situated far away from it at least distance of distinct vision from the eye lens. In this condition, the Magnifying Power of the Gallelian Telescope should be :

Question 6

A ray is incident at an angle of incidence on one surface of a prism of small angle A and emerges normally from the opposite surface. If the refractive index of the material of the prism is μ, the angle of incidence i is nearly equal to

Question 7

What will be the change in the focal length of a lens made up of bullet-proof glass (refractive index = 2.5) when this lens is immersed in oil of refractive index 2.25?

Question 8

Let the refractive index of a denser medium with respect to a rarer medium be n≅12 and its critical angle be θC. At an angle of incidence A when light is travelling from denser medium to rarer medium, a part of the light is reflected and the rest is refracted and the angle between reflected and refracted rays is 90°. Angle A is given by:

Question 9

An object placed at a distance of 16 cm from a convex lens produces an image of magnification m(m > 1). If the object is moved towards the lens by 8 cm then again an image of magnification m is obtained. The numerical value of the focal length of the lens is

Question 10

A convex & a concave lens are brought in close contact along their optical axes. The focal length of the convex lens is 10 cm. When the system is placed at 40 cm from an object, a sharp image of the object is formed on a screen on the other side of the system. Determine the optical power of the concave lens if the distance between the object & the screen is 1 .6 m.

Question 11

The focal length of a planoconvex lens is 20 cm. The plane face of it is silvered. An illumination object is placed at a distance of 60 cm from the lens on its axis on the convex side. Then the distance of the image is

Question 12

A candle flame 3 cm high is placed at distance of 3 metres from a wall. How far (in cm) from the wall must a concave mirror be placed in order that it may form an image of the flame 9 cm high on the wall?

Question 13

In an experiment for determination of refractive index of glass of a prism by i − δ, plot, it was found that a ray incident at angle 35°, suffers a deviation of 40° and that it emerges at angle 79°. In that case which of the following is closest to the maximum possible value of the refractive index?

Question 14

A fish looking up through the water sees the outside world contained in a circular horizon. If the refractive index of water is 4/3 and the fish is 12 cm below the surface, the radius of this circle in cm is

Question 15

Two point white dots are 1 mm apart on a black paper. They are viewed by eye of pupil diameter 3 mm. Approximately, what is the maximum distance at which these dots can be resolved by the eye?
[Take wavelength of light = 500 nm]
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Nov 20JEE & BITSAT