Q441
Open questionThe diamond appears lustrous because of
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Q442
Open questionAssertion (A): In a motion picture, usually 24 frames are projected every second over the whole length of the film.
Reason (R): An image formed on the retina of eye persists for about 0.1s after the removal of the stimulus.
Reason (R): An image formed on the retina of eye persists for about 0.1s after the removal of the stimulus.
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Q443
Open questionWhat is the time difference between the actual passing of the sun over the horizon and out being able to see the image of it on earth?
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Q444
Open questionWhen the object is placed at . . . . . . . ., no image will form in the converging lens?
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Q445
Open questionThe magnification of a mirror must be . . . . . . . . for a virtual and erect image-
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Q446
Open questionThe focal length of a convex mirror is . . . . . . . .
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Q447
Open questionWhich colour is formed when Red and Green are mixed?
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Q448
Open questionThe focal length of a convex lens is 2.5 m. Find its power.
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Q449
Open questionTo get the real reflection, an object is placed at a distance of 30 cm from a concave mirror with a focal length of 20 cm. What will be the distance of image from mirror?
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Q450
Open questionA ray of light when refracted suffers change in velocity. In this context, which one among the following statements is correct?
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Q451
Open questionThe colour of an opaque object is due to the colour it
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Q452
Open questionMagnification is
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Q453
Open questionWhen we see the sky from a plane in high altitude, then it seems
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Q454
Open questionRainbow is produced when Sunlight falls on drops of rain, which of the following physical phenomena are responsible for this?
1. Dispersion
2. Refraction
3. Internal reflection
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1. Dispersion
2. Refraction
3. Internal reflection
Select the correct answer:
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Q455
Open questionWhich colour of light shows maximum deviation when passed through a prism?
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Q456
Open questionLight rays move in straight lines. But through an optical fibre, they can move in any type of zig-zag path because
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Q457
Open questionRed is used as an emergency or danger signal as
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Q458
Open questionWhen light passes from one medium to another medium, which one of the following does not change?
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Q459
Open questionThe formation of glittering colours in thin foam of soap is the result of which of the following phenomenon?
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Q460
Open questionThe primary colours in photography are
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