CBSE Class 10 Science 2017 · Paper 31/1/1 · Question 30
Three students A, B and C focussed a distant building on a screen with the help of a concave mirror. To determine focal length of the concave mirror they measured the distances as given below :
Student A : From mirror to the screen
Student B : From building to the screen
Student C : From building to the mirror
Who measured the focal length correctly :
- (a)Only A
- (b)Only B
- (c)A and B
- (d)B and C
Answer
(a) Only A
🔒 Step-by-step solution
Sign up free to see every step of how it is worked out.
From the board papers
More questions from Light - Reflection and Refraction
Class 10 Science — every question with an expert-verified, step-by-step solution.
- Q1 Which one of the following materials cannot be used to make a le…
- Q1 Define the principal focus of a concave mirror.
- Q2 The image formed by a concave mirror is observed to be virtual, ere…
- Q2 The radius of curvature of a spherical mirror is 20 cm. What is…
- Q3 Where should an object be placed in front of a convex lens to get…
- Q3 Name a mirror that can give an erect and enlarged image of an o…
- Q4 A spherical mirror and a thin spherical lens have each a focal…
- Q4 Why do we prefer a convex mirror as a rear-view mirror in vehic…
- Q5 No matter how far you stand from a mirror, your image appears ere…
- Q6 Which of the following lenses would you prefer to use while rea…
- Q7 We wish to obtain an erect image of an object, using a concave mir…
- Q8 Name the type of mirror used in the following situations. (a) Headl…
All 409 questions on Light - Reflection and Refraction → Browse all Science chapters →