Question

solve it.............​

Answer 1

ʜᴇʏᴀ...

ɢɪᴠᴇɴ :

ᴏʙᴊᴇᴄᴛ ᴅɪsᴛᴀɴᴄᴇ ᴜ= -25ᴄᴍ

ᴍ=1.4 

ᴍ= -ᴠ/ᴜ 

ᴠ= ᴍx -ᴜ = 1.4 x 25 = 14x25/10 = 35 ᴄᴍ

ғʀᴏᴍ ᴍɪʀʀᴏʀ ᴇϙᴜᴀᴛɪᴏɴ :

1/ғ=1/ᴠ+1/ᴜ

1/ғ= 1/35 -1/25

= 5-7/135 = - 2/ 135

ғ= - 87.5ᴄᴍ

sᴏ ғᴏᴄᴀʟ ʟᴇɴɢᴛʜ ᴏғ ᴄᴏɴᴄᴀᴠᴇ ᴍɪʀʀᴏʀ ɪs 87. 5ᴄᴍ

ɪ ʜᴏᴘᴇ ɪᴛs ʜᴇʟᴘ ᴜ ✔✔✔

Answer 2

.•♫•GE •♫•.

u = -20cm

m = 2

now,m = -v/u

v= -mu

= 2×20

= 40 cm

now, 1/u + 1/v = 1/f

1/f = -1/20 +1/40

1/f = -1/40

f = -40

now, R = 2f

= -2 ×40

= -80 c.m.

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