Question

what is focal length should watch man keep convex glass​

Answer 1

Answer:

focal length is hate of redis

Answer 2

Answer:

given,

focal length f = 8cm

pi = 1.5

1/f = ( pi - 1 ) ( 1/r1 - 1/r2 )

1/8 = ( 1.5 - 1 ) ( 1/r1 - 1/r2 )

1/8 = ( 0.5 ) ( 1/r1 - 1/r2 )

( 1/r1 - 1/r2 ) = 1/4

lens when immersed in water,

1/FW = ( pi g/pi w - 1 ) ( 1/r1 - 1/r2 )

( 1.5/1.33 - 1 ) 1/4

1/8 × 1/4

1/FW = 1/32

fw = 32

Explanation:

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