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Explain: In viewing through a magnifying glass, one usually positions one’s eyes very close to the lens. Does angular magnification change if the eye is moved

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

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Explain: Why must both the objective and the eyepiece of a compound microscope have short focal

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Explain: When viewing through a compound microscope, our eyes should be positioned not on the eyepiece but a short distance away from it for best viewing. Why? How much should be that short distance between the eye and

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

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How does focal length of a lens change when red light incident on it is replaced by violet light? Give reason for your

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Why does the sky appear

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(i) The bluish colour predominates in clear sky. (ii) Violet colour is seen at the bottom of the spectrum when , white light is dispersed by a prism. State reasons to explain these

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

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Find the radius of curvature of the convex surface of a plano-convex lens, whose focal length is 0.3 m and the refractive index of the material of the lens is 1 .5

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

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Draw a schematic diagram of refracting telescope. Write its two important

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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

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 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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When light travels from a rarer to a denser medium, the speed decreases. Does this decrease in speed imply a decrease in the energy carried by the light wave? Justify your

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

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Draw a diagram to show refraction of a plane wavefront incident on a convex lens and hence draw the refracted

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

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

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Use Huygens' principle to verify the laws 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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State clearly how an unpolarised light get linearly polarised, when passed through a polaroid. (i) Unpolarised light of intensity `I_0` is incident on a polaroid `P_1` which is kept near polaroid `P_2` whose pass axis is parallel to that of `P_1`. How will the intensities of light, `I_1 and I_2` transmitted by the polaroids `P_1 and P_2` respectively, change on rotating `P_1` without disturbing `P_2` ? (ii) Write the relation between the intensities `I_1 and

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

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Consider sunlight incident on a slit of width 104 A. The image seen through the slit

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Fig. shows a standard two slit arrangement with slits S1, S2. P1, P2 are the two minima points on either side of P (Fig. ). At P2 on the screen, there is a hole and behind P2 is a second 2- slit arrangement with slits S3, S4 and a second screen behind

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

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