1. Fill in the blanks.
(a) An image that cannot be obtained on a screen is called a ____________.
(b) Image formed by a convex __________ is always virtual and smaller in size.
(c) An image formed by a __________ mirror is always of the same size as that of the object.
(d) An image which can be obtained on a screen is called a _________ image.
(e) An image formed by a concave ___________ cannot be obtained on a screen.
1. Fill in the blanks.
(a) An image that cannot be obtained on a screen is called a ____________.
(b) Image formed by a convex __________ is always virtual and smaller in size.
(c) An image formed by a __________ mirror is always of the same size as that of the object.
(d) An image which can be obtained on a screen is called a _________ image.
(e) An image formed by a concave ___________ cannot be obtained on a screen.
Explanation:
(a) Virtual Image
(b) Mirror
(c) Plane
(d) Real
(e) Lens
2. 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 form 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)
2. 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 form 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)
Explanation:
(a) False
(b) True
(c) True
(d) False
(e) False
3. Match the items given in Column I with one or more items in Column II.
Column-I Column-II
(a) A plane mirror (i) Used as a magnifying glass.
(b) A convex mirror (ii) Can form images 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.
3. Match the items given in Column I with one or more items in Column II.
Column-I Column-II
(a) A plane mirror (i) Used as a magnifying glass.
(b) A convex mirror (ii) Can form images 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.
Explanation:
(a) A plane mirror Matches with The image is erect and of the same size as the object.
(b) A convex mirror Matches with Can form images of objects spread over a large area.
(c) A convex lens Matches with Used as a magnifying glass.
(d) A concave mirror Matches with Used by dentists to see an enlarged image of teeth.
(e) A concave lens Matches with The image is erect and smaller in size than the object.
4. State the characteristics of the image formed by a plane mirror ?
4. State the characteristics of the image formed by a plane mirror ?
Explanation:
Characteristics of the image formed by a plane mirror are as follows :
(i) Size of image is equal to size of the object.
(ii) Distance of image from mirror is equal to distance of object from mirror.
(iii) Image is laterally inverted.
(iv) Image formed is virtual.
(v) Image formed is Erect.
5. Find out the letters of the English alphabet or any other language known to you in which the image formed in a plane mirror appears exactly like the letter itself. Discuss your findings ?
5. Find out the letters of the English alphabet or any other language known to you in which the image formed in a plane mirror appears exactly like the letter itself. Discuss your findings ?
Explanation:
The image formed by a plane mirror for english letter A,H,I,M,O,T,U,V,W,X and Y is exactly like the letter itself if we put a mirror at the centre vertically.
6. What is a virtual image? Give one situation where a virtual image is formed.
6. What is a virtual image? Give one situation where a virtual image is formed.
Explanation:
The image which cannot be obtained on a screen is called Virtual Image.
The image is formed by a plane mirror is always a virtual image. The image appears behind the mirror and it cant't be obtained on a screen.
7. State two differences between a convex and a concave lens ?
7. State two differences between a convex and a concave lens ?
Explanation:
Convex lens
(i) The convex lens is curved outside. it is thinner at it's centre than it's edge.
(ii) Convex lens can formed both real and virtual image based on the location of a object.
Concave lens
Explanation:
(i) The concave lens is curved inside, it is thinner at it's centre than it's edge.
(ii) Image formed by a concave lens is always erect and virtual.
8. Give one use each of a concave and a convex mirror ?
8. Give one use each of a concave and a convex mirror ?
Explanation:
Concave mirror is used to a shaving mirror.
Convex mirror is used as a side view mirror in vehicles.
10. Which type of lens always forms a virtual image?
10. Which type of lens always forms a virtual image?
Explanation:
Concave lens is always forms a virtual image.
11. Choose the correct option :
A virtual image larger than the object can be produced by a
(i) concave lens (ii) concave mirror
(iii) convex mirror (iv) plane mirror
11. Choose the correct option :
A virtual image larger than the object can be produced by a
(i) concave lens (ii) concave mirror
(iii) convex mirror (iv) plane mirror
Explanation:
Concave mirror
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