Question

Q) 11 And Q) 12 plz solve it Mai nehi ker parahi hu it's hard plz help
and don't text waste answer like I don't know and before texting waste messages kindly see my profile it will be better for you........... so if you know answer plz help​

Answer 1

Answer:

11a-focal length

b-make ray diagram of case

when the object is at infinity and the image will be at focus

12a- Power=1/focal length

b-lenses having lesser focal length used to obtain more convergent light so 20 cm