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Class XII Physics Ray Optics 3

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Question 1

A convex lens of focal length ‘f’ is placed between an object and screen. Distance between object and screen is 15 cm. If magnification produced by lens is 3, then the focal length ‘f’ is

Question 2

A thin convex lens of focal length 2 m has an object placed at a distance of 0.5 m from it. The image formed is

Question 3

A student measures the focal length of a convex lens by putting an object pin at a distance u from the lens and measuring the distance v of the image pin. The graph between u and v plotted by the student should look like

Question 4

A thin hollow equi-convex lens, silvered at the back, converges a parallel beam of light at a distance of 0.2 m in front of it. where will it converge the same light if filled with water having μ = 4/3?

Question 5

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 6

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 7

A thin glass (refractive index 1.5) lens has optical power of - 5D in air. Its optical power in a liquid medium with refractive index 1.6 will be

Question 8

An object 2.4 m in front of a lens forms a sharp image on a film 12 cm behind the lens. A glass plate 1 cm thick, of refractive index 1.50 is interposed between lens and film with its plane faces parallel to film. At what distance (from lens) should object be shifted to be in sharp focus on film?

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Jun 9JEE & BITSAT