Lakshya Education MCQs

Question:  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.


Options:

: Each correct match: 1 Mark
Column I Column II
(a) A plane mirror (v) The image is erect and of the same size as the object.
(b) A convex mirror (ii) Can form the image of objects spread over a large area.
(c) A convex lens (i) Used as a magnifying glass.
(d) A concave mirror (iii) Used by dentists to see an enlarged image of teeth.
(e) A concave lens ​​​​​​​(vi) The image is erect and smaller in size than the object.

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More Questions on This Topic :

Question 1. Give three uses of Convex mirrors.  [3 MARKS]

: Uses : 1 Mark each

(i)They are also put on corners of roads so that you can see any cars coming to avoid collisions.
(ii)Convex mirrors are also used in making lenses of sunglasses to help reflect the light of sun away from the eyes of the person wearing the sunglasses.
(iii)They are also used in telescopes.
Question 2. What do you mean by:

(i) Ray of light

(ii) Beam of light  [2 MARKS]

: Sub-parts: 1 Mark each

(i) A ray of light indicates a single ray of light.
(ii) A bundle of light rays collectively is called a Beam of light.
Question 3. Which type of spherical mirror is used as reflectors at sharp turns or blind corners in big shopping malls or as rear-view mirrors in cars?  [2 MARKS]

: Answer : 1 Mark
Reason : 1 Mark

Convex mirror is used as reflectors at sharp turns or blind corners.

Convex mirrors are also known as converging mirror. Because of this the image formed by the mirror is a converged image of numerous objects. This gives the driver a larger field of vision thus, helping them take well-informed decisions.
Question 4. Find out the letters of the English alphabet in which the image formed by a plane mirror appears exactly like the letter itself. Discuss your findings. [2 MARKS]

: Explanation: 2 Marks

If the letters of English alphabet A, H, I, M, O, T, U, V, W, X, Y are kept in front of a plane mirror, then they would form images which exactly look like the original letters of the alphabet. These letters are vertically symmetric. For example, if we divide letters A and U in the middle, then we would find that the right halves are equivalent to the left halves of the letters.



Hence, even if the image interchanges sidewise, it will appear same as the letter.
Question 5. (a) While standing before a plane mirror, if you move your right hand to the right, which hand does your image move?

(b) 
What is the angle of incidence of a ray if the reflected ray is at an angle of 90 to the incident ray?

 [3 MARKS]

: (a) Answer: 1.5 Marks
(b) Answer with explanation: 1.5 Marks

(a) A mirror image formed by a plane mirror is identical in size and shape but is laterally inverted.
If we move our right hand to the right, our image will move the left hand towards the left. It is because in a plane mirror our "left appears right” and "right appears left”. This is called a lateral inversion.

(b) According to the law of reflection, the angle ofincidence is equal to the angle of reflection. I
f the reflected ray is at an angle of 90 to the incident ray, it implies that the reflected ray will be making an angle of 45 from the normal. Hence, the angle of reflection is45, therefore the angle of incidence of the ray is45 according to the law of reflection.
Question 6. Is light necessary to see objects?  [1 MARK]

: Answer : 1 Mark

Yes, light is necessary to see objects. If there is no light then there will be no reflection from an object and no light will reach our eye and we will not be able to see any object.

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