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asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

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You are given four sources of light each one providing a light of a single colour – red, blue, green and yellow. Suppose the angle of refraction for a beam of yellow light corresponding to a particular angle of incidence at the interface of two media is 90°. Which of the following statements is correct if the source of yellow light is replaced with that of other lights without changing the angle of

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

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The radius of curvature of the curved surface of a plano-convex lens is 20 cm. If the refractive index of the material of the lens be 1.5, it

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

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The phenomena involved in the reflection of radiowaves by ionosphere is similar

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

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The direction of ray of light incident on a concave mirror is shown by PQ while directions in which the ray would travel after reflection is shown by four rays marked 1, 2, 3 and 4 (Fig ). Which of the four rays correctly shows the direction of reflected

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

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The optical density of turpentine is higher than that of water while its mass density is lower. Fig . shows a layer of turpentine floating over water in a container. For which one of the four rays incident on turpentine in Fig . the path shown is

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

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A car is moving with at a constant speed of 60 km h–1 on a straight road. Looking at the rear view mirror, the driver finds that the car following him is at a distance of 100 m and is approaching with a speed of 5 km h –1. In order to keep track of the car in the rear, the driver begins to glance alternatively at the rear and side mirror of his car after every 2 s till the other car overtakes. If the two cars were maintaining their speeds, which of the following statement (s) is/are

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

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There are certain material developed in laboratories which have a negative refractive index (Fig). A ray incident from air (medium 1) into such a medium (medium 2) shall follow a path given

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

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Consider an extended object immersed in water contained in a plane trough. When seen from close to the edge of the trough the object looks distorted

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

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A rectangular block of glass ABCD has a refractive index 1.6. A pin is placed midway on the face AB (Fig). When observed from the face AD, the pin

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

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Between the primary and secondary rainbows, there is a dark band known as Alexandar’s dark band. This is

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

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A magnifying glass is used, as the object to be viewed can be brought closer to the eye than the normal near point. This results

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

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An astronomical refractive telescope has an objective of focal length 20m and an eyepiece of focal length

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

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Will the focal length of a lens for red light be more, same or less than that for blue

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

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The near vision of an average person is 25cm. To view an object with an angular magnification of 10, what should be the power of the

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

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An unsymmetrical double convex thin lens forms the image of a point object on its axis. Will the position of the image change if the lens is

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

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For a glass prism (μ = `sqrt3` ) the angle of minimum deviation is equal to the angle of the prism. Find the angle of the

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

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A short object of length L is placed along the principal axis of a concave mirror away from focus. The object distance is u. If the mirror has a focal length f, what will be the length of the image? You may take L <<|v -

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

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A circular disc of radius ‘R’ is placed co-axially and horizontally inside an opaque hemispherical bowl of radius ‘a’ (Fig). The far edge of the disc is just visible when viewed from the edge of the bowl. The bowl is filled with transparent liquid of refractive index μ and the near edge of the disc becomes just visible. How far below the top of the bowl is the disc

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

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A thin convex lens of focal length 25 cm is cut into two pieces 0.5 cm above the principal axis. The top part is placed at (0,0) and an object placed at (–50 cm, 0). Find the coordinates of the

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

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