CBSE 12th Standard Physics Subject Wave Optics Ncert Exemplar 3 Mark Questions 2021
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CBSE 12th Standard Physics Subject Wave Optics Ncert Exemplar 3 Mark Questions 2021
12th Standard CBSE
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Reg.No. :
Physics
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A candle flame is held 3 cm away from a concave mirror of radius of curvature 24 cm. Where is the image formed? What is the nature of the image?
(a) -
An object is placed in front of a convex mirror of focal length 30cm. If the image is a quarter of the size of the object, find the position of the image.
(a) -
The radii of curvature of the surface of a double convex lens are 20 cm and 40 cm focus length 20 cm. What is refractive index of the material of the lens?
(a) -
(i) A mobile phone lies along the principal axis of a concave mirror. Show with the help of a suitable diagram the formation of its image.Explain why magnification is not uniform.
(ii) Suppose the lower half of the concave mirror's reflecting surface is covered with an opaque material. What effect this will have on the image of the object? Explain.(a) -
Use the mirror equation to show that,
(ii) a convex mirror always produces a virtual image independent of the location of the object.
(iii) an object placed between the pole and focus of a concave mirror produces a virtual and enlarged image.(a)
