Solutions of Reflection of Light (Page No- 200) - Physics By Lakhmir Singh, Class 10 Class 10 Notes | EduRev

Class 10 Physics Solutions By Lakhmir Singh & Manjit Kaur

Class 10 : Solutions of Reflection of Light (Page No- 200) - Physics By Lakhmir Singh, Class 10 Class 10 Notes | EduRev

The document Solutions of Reflection of Light (Page No- 200) - Physics By Lakhmir Singh, Class 10 Class 10 Notes | EduRev is a part of the Class 10 Course Class 10 Physics Solutions By Lakhmir Singh & Manjit Kaur.
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Lakhmir Singh Physics Class 10 Solutions Page No:200

Question 42: Between which two points of concave mirror should an object be placed to obtain a magnification of:
 (a) -3
 (b) +2.5
 (c) – 0.4

Solution : (a) Between focus and centre of curvature.
(b) Between pole and focus.
(c) Beyond the centre of curvature

Question 43: At what distance from a concave mirror of focal length 10 cm should an object be placed so that:
 (a) its real image is formed 20 cm from the mirror ?
 (b) its virtual image is formed 20 cm from the mirror ?

Solution :

Solutions of Reflection of Light (Page No- 200) - Physics By Lakhmir Singh, Class 10 Class 10 Notes | EduRev
Solutions of Reflection of Light (Page No- 200) - Physics By Lakhmir Singh, Class 10 Class 10 Notes | EduRev

Question 44: If a concave mirror has a focal length of 10 cm, find the two positions where an object can be placed to give, in each case, an image twice the height of the object.

Solution : f = -10cm

Case 1: m = 2 (Image is virtual and erect) 

Solutions of Reflection of Light (Page No- 200) - Physics By Lakhmir Singh, Class 10 Class 10 Notes | EduRev

Case 2:m = -2 (Image is real and inverted)

Solutions of Reflection of Light (Page No- 200) - Physics By Lakhmir Singh, Class 10 Class 10 Notes | EduRev

Question 45: A mirror forms an image which is 30 cm from an object and twice its height.
 (a) Where must the mirror be situated ?
 (b) What is the radius of curvature ?
 (c) Is the mirror convex or concave ?

Solution : Let the image formed is virtual and erect,
v - u = 30cm
m = 2

Solutions of Reflection of Light (Page No- 200) - Physics By Lakhmir Singh, Class 10 Class 10 Notes | EduRev
Solutions of Reflection of Light (Page No- 200) - Physics By Lakhmir Singh, Class 10 Class 10 Notes | EduRev

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