Check sibling questions

Solutions - CBSE Class 10 Sample Paper for 2022 Boards - Science [MCQ]

Chapter 1 Class 6 - Food: Where does it come from? →
Class 10
Solutions to CBSE Sample Paper - Science Class 10

Question 43 - Solutions - CBSE Class 10 Sample Paper for 2022 Boards - Science [MCQ] - Solutions to CBSE Sample Paper - Science Class 10

Last updated at March 16, 2023 by

If the real image of a candle flame formed by a lens is three times the size of the flame and the distance between lens and image is 80 cm, at what distance should the candle be placed from the lens? 

(A) -80cm 

(B) -40 cm 

(C) -40/3 cm 

(D) -80/3 cm



Slide3.JPG

Slide4.JPG
Slide5.JPG

Answer - So, the correct answer is (d)

Get live Maths 1-on-1 Classs - Class 6 to 12

Book 30 minute class for ₹ 499 ₹ 299

Transcript

Question 43 If the real image of a candle flame formed by a lens is three times the size of the flame and the distance between lens and image is 80 cm, at what distance should the candle be placed from the lens? (A) -80cm (B) -40 cm (C) -40/3 cm (D) -80/3 cm As image is real, it will also be inverted ∴ Magnification is negative Thus, m = −3 Also, Distance between lens and image is 80 cm Since it is a real image, image Distance will be positive. ∴ V = 80 cm We need to find, At what distance should candle be from the lens ∴ we need to find u Now, m = 𝑉/𝑢 −3 = 80/4 u = 80/(−3) u = − 𝟖𝟎/𝟑 cm So, the correct answer is (D)

Ask a doubt
Maninder Singh's photo - Co-founder, Teachoo

Made by

Maninder Singh

CA Maninder Singh is a Chartered Accountant for the past 13 years and a teacher from the past 17 years. He teaches Science, Economics, Accounting and English at Teachoo