Where should an object be placed in front of a convex lens to get a real to get real image of the size of the object ?A. at the principalB. at twice the focal lengthC. at infinityD. between the optical centre of the lens its principal focus

Where should an object be placed in front of a convex lens to get a re

1.	Where should an object be placed in front of a convex lens to get a real to get real image of the size of the object ?A. at the principalB. at twice the focal lengthC. at infinityD. between the optical centre of the lens its principal focus
Answer» Correct Answer - A at twice the focal length

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Assertion : For real objects, image formed by a convex mirror always lies between pole and focus. Reason : When object moves from pole to infinity, its image will move from pole to focus.A. (a) If both Assertion and Reason are true and the Reason is correct explanation of the Assertion.B. (b) If both Assertion and Reason are true but Reason is not the correct explanation of Assertion.C. (c) If Assertion is true, but the Reason is false.D. (d) If Assertion is false but the Reason is true.
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A ball swings back and forth in front of a concave mirror. The motion of the ball is described approximately by the equation `x= f cos (omega)t`, where f is the focal length of the mirror and x is measured along the axis of mirror. The origin is taken at the centre of curvature of the mirror. (a) Derive an expression for the distance from the mirror of the image of the swinging ball. (b) At what point does the ball appear to coincide with its image? (c) What will be the lateral magnifiaction of the image of the ball at time `t= T/2`, where T is time period of oscillation?
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Two plane mirrors A and B are aligned parallel to each other as shown in the figure. A light ray is incident at an angle of `30^(@)` at a point just inside one end of A. The number of times the ray undergoes reflections (including the first one) before it emerges out is A. `29`B. `30`C. `31`D. `32`

Where should an object be placed in front of a convex lens to get a real to get real image of the size of the object ?A. at the principalB. at twice the focal lengthC. at infinityD. between the optical centre of the lens its principal focus

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