light (reflection and refraction)

Question 1

power of lens formula

Answer 1

P = 1/f

Question 2

lens formula

Answer 2

1/f=1/u - 1/v

Question 3

diopter definition

Answer 3

1 diopter is the power of lens whose focal length is 1 meter

Question 4

power of lens definition

Answer 4

reciprocal of focal length

Question 5

CONVEX LENS

position of object = at infinity

Answer 5

at focus f2

highly diminished

Question 6

CONVEX LENS

position of object = beyond 2f1

Answer 6

between f2 and 2f2

diminished

Question 7

CONVEX LENS

position of object = at 2f1

Answer 7

at 2f2

same size

Question 8

CONVEX LENS

position of the object = between f1 and 2f1

Answer 8

beyond 2f2

enlarged

Question 9

CONVEX LENS

position of the object = at focus f1

Answer 9

at infinity

highly enlarged

Question 10

CONVEX LENS

position = between f1 and the optical centre

Answer 10

on same side of lens as the object

Question 11

CONCAVE LENS

position of the object = at infinity

Answer 11

at focus f1

highly diminished

Question 12

CONCAVE LENS

position = between optical centre and infinity

Answer 12

between f1 and the optical center

diinished

Question 13

CONCAVE MIRROR

object = at infinity

Answer 13

at f

highly diminished

Question 14

CONCAVE MIRROR

object = beyond c

Answer 14

between f and c

diminished

Question 15

CONCAVE MIRROR

object = at c

Answer 15

at c

same size

Question 16

CONCAVE MIRROR

object = between c and f

Answer 16

beyond c

enlarged

Question 17

if m is +ve then the nature is

Answer 17

virtual

Question 17

CONCAVE MIRROR

object = at f

Answer 17

at infinity

higly enlarged

Question 18

CONCAVE MIRROR

object = between p and f

Answer 18

behind the mirror

enlarged

Question 19

if m is -ve then nature is

Answer 19

real

Question 20

m>1

Answer 20

enlarged

Question 21

m=1

Answer 21

same size

Question 21

m<1

Answer 21

diminished

Question 22

m is +ve an d more than 1

Answer 22

concave

Question 23

m is +ve and less than 1

Answer 23

convex