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Name the instrument which can accurately measure the following
The diameter of a needle
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Name the instrument which can accurately measure the following
The thickness of a paper
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Name the instrument which can accurately measure the following
The diameter of a pencil.
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Name the instrument which has the least count
0.01 mm
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Explain the following term:
Incident ray
Draw diagram/diagrams to show them.
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The letters on the front of an ambulance are written laterally inverted like 
. Give reason.
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State the number of images of an object placed between two mirrors, formed in each case when mirrors are inclined to each other at (a) 90°, and (b) 60°.
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Name the two kinds of spherical mirrors and distinguish between them.
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Define the terms pole, principal axis and centre of curvature with reference to a spherical mirror.
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Draw suitable diagrams to illustrate the action of (i) concave mirror and (ii) convex mirror on a beam of light incident parallel to the principal axis.
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Name the spherical mirror which (i) diverges (ii) converges the beam of light incident on it. Justify your answer by drawing a ray diagram in each case.
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Define the terms focus and focal length of a concave mirror. Draw diagram to illustrate your answer.
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Explain the meaning of the terms focus and focal length in case of a convex mirror, with the help of suitable ray diagram.
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Name the mirrors shown in Figure (a) and (b).
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In each case (a) and (b), draw reflected rays for the given incident rays and mark focus by the symbol F.
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Complete the following diagrams in Figure by drawing the reflected rays for the incident rays 1 and 2.
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Complete the following diagrams shown in Fig. by drawing the reflected ray for each of the incident ray A and B.
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State the two convenient rays that are chosen to construct the image by a spherical mirror for a given object? Explain your answer with the help of suitable ray diagrams.
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Figure shows a concave mirror with its pole at P, focus F and centre of curvature C. Draw ray diagram to show the formation of image of an object OA.
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