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A biconvex lens made of a transparent material of refractive index 1.5 is immersed in a water of refractive index 1.33. Will the lens behave as a converging or a diverging lens? Give

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You are given three lenses `L_1,L_2 and L_3` each of focal length 10 cm. An object is kept at 15 cm in front of `L_1` as shown. The final real image is formed at the focus `I` of `L_3` . Find the separation between `L_1, L_2 and

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An object of 2 cm height is placed at a distance of 30 cm from a convex mirror of focal length 15 cm. Find the nature, position and size of the image

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The velocity of a certain monochromatic light in a given transparent medium is `2.225 xx10^8` m/s. What is the (i) critical angle of incidence (ii) polarising angle for this

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Define the resolving power of a telescope. Write any two advantages of a reflecting telescope over a refracting

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A compound microscope uses an objective lens of focal length 4 cm and eyepiece lens of focal length 10 cm. An object is placed at 6 cm from the objective lens. Calculate the magnifying power of the compound microscope. Also, calculate the length of the

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A short pulse of white light is incident from air to a glass slab at normal incidence. After travelling through the slab, the first colour to emerge

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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 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

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What is the shape of the wavefront in each of the following cases: The portion of the wavefront of light from a distant star intercepted by the

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A beam of light consisting of two wavelengths, 650 nm and 520 nm, is used to obtain interference fringes in a Young’s double-slit experiment. Find the distance of the third bright fringe on the screen from the central maximum for wavelength 650

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Answer the following questions: In a single slit diffraction experiment, the width of the slit is made double the original width. How does this affect the size and intensity of the central diffraction

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

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A parallel beam of light of wavelength 500 nm falls on a narrow slit and the resulting diffraction pattern is observed on a screen 1 m away. It is observed that the first minimum is at a distance of 2.5 mm from the centre of the screen. Find the width of the

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Using Huygens' geometrical construction of wavefronts, show how a plane wave gets reflected from a surface. Hence, verify laws of

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Laser light of wavelength 630 nm incident on a pair of slits produces an interference pattern in which the bright fringes are separated by 7.2 mm. Calculate the wavelength of another source of laser light which produce interference fringes separated by 8.1 mm using same pair of

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In Young's double slit experiment, monochromatic light of wavelength 600 nm illuminates the pair of slits and produces an interference pattern in which two consecutive bright fringes are separated by 10 mm. Another source of monochromatic light produces the interference pattern in which the two consecutive bright fringes are separated by 8 mm. Find the wavelength of light from the second source. What is the effect on the interference fringes if the monochromatic source is replaced by a source of white

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

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Unpolarised light is incident on a plane surface of glass of refractive index p at an angle i. If the reflected light gets totally polarised, write the relation between the angle i and refractive

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

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Two source `S_1` and `S_2` of intensity `I_1` and `I_1` are placed in front of a screen [Fig. (a)]. The patteren of intensity distribution seen in the central portion is given by Fig. (b). In this case which of the following statements are true.

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Fig. shown a two slit arrangement with a source which emits unpolarised light. P is a polariser with axis whose direction is not given. If `I_0` is the intensity of the principal maxima when no polariser is present, calculate in the present case, the intensity of the principal maxima as well as of the first

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An electron and a photon each have a wavelength of 1.00 nm. Find the energy of the

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

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