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CBSE Class 10 Sample Paper Science Solution - For 2023 Boards

Class 10
Solutions to CBSE Sample Paper - Science Class 10

A slide projector has a convex lens with a focal length of 20 cm. The slide is placed upside down 21 cm from the lens. How far away should the screen be placed from the slide projector’s lens so that the slide is in focus?

 

Answer:

1/f= 1/v- 1/u

1/20 = 1/v- 1/-20

1/v = 1/20 - 1/21

= (21 - 20)/420

= 1/420

v= 420 cm

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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