Question

For the 7th question do we need to use the given cm for the object distance and 20cm for focal length .....cuz it's a big no. N I don't have so much space in my A4 sheet . Some suggestions on how shuld I do it .

Answer 1

here..u dont have to draw such big dimenson

firstly usind lens formula find position of image formed (v)

Then draw a small diagram and just mention the numerical values given in the question

Dont draw 20 cm or 30 cm long line ..draw a small line and mark it 20 or 30 whatever given in the question !!