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Spherical Lenses

Mention a cas...

Question

Mention a case when a concave lens forms a real image.

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Solution

Generally concave lens do not form real image, but real image can be obtained if object is virtual i.e converging rays must incident on the lens.

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Q. A real image is formed by a convex lens. When it is cemented with a concave lens, again the real image is formed. The real image formed by concave lens :

Q. A virtual image twice as big as the object is formed by a concave lens when the object is 10 cm away from it. A real image twice as big as the object will be formed when it is placed at a distance from the lens :

Mark ‘T’ if the statement is true and ‘F’ if it is false:

(a) We can obtain an enlarged and erect image by a convex mirror. (T/F)

(b) A concave lens always forms a virtual image. (T/F)

(c) We can obtain a real, enlarged and inverted image by a concave mirror. (T/F)

(d) A real image cannot be obtained on a screen. (T/F)

(e) A concave mirror always forms a real image. (T/F)

Q. A concave lens always forms a diminished, image.

Q. Fill in the following blanks with suitable words:
(a) A convex lens .................. rays of light, whereas a concave lens .................. rays of light.
(b) Lenses refract light to form images: a..................... lens can form both real and virtual images, but a diverging lens forms only ...................... images.

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