Question 11

State whether the following statements are True or False.
(a) A concave lens can be used to produce an enlarged and erect image.
(b) A convex lens always produces a real image.
(c) The sides of an object and its image formed by a concave mirror are always interchanged.
(d) An object can be seen only if it emits light.

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Solution

(a) False, a concave lens can only form a virtual, erect and diminished image.
(b) False, a convex lens can form real or virtual, inverted or erect magnified and diminished images depending upon the position of the object.
(c) True, the image formed by a concave mirror shows lateral inversion, i.e. left seems to be right and right seems to be left.
(d) False, an object can be seen if it reflects the light falling on it.

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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)

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

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

Question 4

You are provided with a concave mirror, a convex mirror, a concave lens and a convex lens. To obtain an enlarged image of an object you can use either

(a) concave mirror or convex mirror.

(b) concave mirror or convex lens.

(d) concave lens or convex lens.

Q. For performing an experiment, a student was asked to choose one concave mirror and one convex lens from a lot of mirrors and lenses of different kinds. the correct procedure adopted by her will be:
(1) To choose a mirror and lens which can form an enlarged and erect image of an object.
(2) To choose a mirror which can form a diminished and erect image and a lens which can form an enlarged and erect image of the object.
(3) To choose a mirror which can form an enlarged and erect image and a lens which can form a diminished and erect image of an object.
(4) To choose a mirror and a lens which can form a diminished and erect image of an object.

Match the following: [5 MARKS]

Column I	Column II
(a) A plane mirror	(i) Used as a magnifying glass.
(b) A convex mirror	(ii) Can form the image of objects spread over a large area.
(c) A convex lens	(iii) Used by dentists to see an enlarged image of teeth.
(d) A concave mirror	(iv) The image is always inverted and magnified.
(e) A concave lens	(v) The image is erect and of the same size as the object.
	(vi) The image is erect and smaller in size than the object.

State whether the following statements are 'true' or 'false' by writing T/F against them.

(a) A convex lens has a divergent action and a concave lens has a convergent action.

(b) A concave lens, if kept at a proper distance from an object, can form its real image.

(d) A ray of light incident at the optical centre of lens, passes undeviated after refraction.

(e) A concave lens forms a magnified or diminished image depending on the distance of object from it.

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Standard VII Physics

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