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Reflection of light Problems






Short answer type Reflection of light Problems

Question 1
Define the following terms used in the reflection of light
(a) Incident ray
(b) Normal
(c) Reflected ray
(d) Angle of incidence
(e) Angle of reflection
Question 2
Which of the following statements is true?
(a) The image formed in a plane mirror is real
(b) The image in the plane mirror is of the same size as the object
(c) An object is placed at a distance of 20 cm in front of plane mirror; the image formed would be 40 cm from the object
(d) The image formed in a plane mirror is laterally inverted.
Question 3
(a) What is lateral inversion? Explain by giving suitable example.
(b) How would the letter ‘F’ appear in front of plane mirror?
Question 4
What kind of mirror is used in vehicles to see the traffic on the rear side?
(a) Convex mirror
(b) Plane mirror
(c) Concave mirror
Question 5
Which of the following is true for concave mirror?
(a) When the object is at infinity, the image is formed at focal point.
(b) It forms both highly enlarged and highly diminished images
(c) When the object is placed at center of curvature, image is real, inverted and positioned at C only.
(d) Image formed is always virtual and erect.
Question 6
Rays from sun converge at a point 15 cm in front of concave mirror. Where the object should be placed so that size of its image is equal to the size of the object?
(a) 15 cm in front of the mirror
(b) 30 cm in front of the mirror
(c) Between 15 cm and 30 cm in front of the mirror
(d) more than 30 cm in front of the mirror


Question 7
In torches, search lights and headlights of vehicles bulb is placed
(a) Between pole and focus of the reflector
(b) Very near to the focus of reflector
(c) Between the focus and center of curvature of the reflector
(d) At the center of curvature of the reflector
Question 8
At what distance from a concave mirror of focal length 10 cm should an object 2 cm long be placed in order to get erect image 6 cm tall.
Question 9
John is standing in front of a special mirror. He finds image of his head smaller, the middle portion of his body the same size and the legs bigger. The following is the order of combinations for the special mirror from the top
(a) Plane, convex, concave
(b) Convex, concave, plane
(c) Concave, plane, convex
(d) Convex, plane and concave
Question 10
Which of the following statements is true?
(a) A convex lens has 5 dioptre power having a focal length 0.20 m
(b) A convex lens has -5 dioptre power having a focal length 0.20 m
(c) A concave lens has 5 dioptre power having a focal length 0.20 m
(d) A concave lens has -5 dioptre power having a focal length 0.20 m

Answer
2. (d)
4. (a)
5. (a),(b) and (c)
6. (b) as F=15 cm and C= 2F=30 cm
7. (b)v 8.
f = -10 cm
$h_o = 2$ cm
$h_i=6$ cm
Magnification
$m = \frac {h_i}{h_o} = \frac {6}{2} = 3$ (erect image)
Now it is also given as
$m = -\frac {v}{u}$
$3 = -\frac {v}{u} $
v = -3u
Mirror formula
$\frac {1}{u} + \frac {1}{v} = \frac {1}{f}$
$ \frac {1}{-3u} + \frac {1}{u} = \frac {1}{-10}$
u = -20/3 = -6.7 cm
9. (d) 10. (a)

Long answer type questions Reflection of light Problems

Question 1
State the relation between the object distance, image distance and focal length of the mirror.
Question 2
Draw ray diagrams showing the image formation by a convex mirror when an object is placed at
(a) infinity
(b) at finite distance from the mirror
Question 3
Draw ray diagrams showing the image formation by a concave mirror when an object is placed
(a) at focal point
(b) at center of curvature
(c) Between focal point and center of curvature
Question 4
Write down the five uses of each convex and concave mirror?

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Class 10 Maths Class 10 Science

Practice Question

Question 1 Which among the following is not a base?
A) NaOH
B) $NH_4OH$
C) $C_2H_5OH$
D) KOH
Question 2 What is the minimum resistance which can be made using five resistors each of 1/2 Ohm?
A) 1/10 Ohm
B) 1/25 ohm
C) 10 ohm
D) 2 ohm
Question 3 Which of the following statement is incorrect? ?
A) For every hormone there is a gene
B) For production of every enzyme there is a gene
C) For every molecule of fat there is a gene
D) For every protein there is a gene






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