Question

21. A convex lens of focal le
at a distance of 0.08 m from the lens
22. A convex lens of focal length 5 mm
determine the size and nature of the ima
23. Determine how far an object must be
oduce an erect (upright) image of linear magnification 4
24. A lens of focal length 20 cm is used to prod
far must the slide be placed from the lens ?
25. An object placed 4 an in front of a conve
(a) What is the magnification of the image ?
(b) What is the focal length of the lens ?
(cDraw a ray diagram to show the formation of inage. Mark dearly Fand 2F in the
om is used to form a magnifted image of an object of her som
om the lens. Calculate the position, nature and size of the image
th 6 cm is held 4 cm from a newspaper which has print 15 cm
e and nature of the image produced.
biect must be placed in front of a converging lets of focal length a com
m
is used to produce a ten times magnified image of a fim shde on seen Home
a
in front of a converging lens produces a real image 12 on bom the less
Long Answer Type Questions
26. a) An object 2 cm tall stands on the principal axis of a converging lens of focal lengths am Fade
position, nature and size of the image formed if the object is ;
17 12 cm from the lens
(ii) 6 cm from the lens
te one practical application each of the use of such a lens with the object in positions and​

Answer 1

Answer:

Explanation:

21)

f = 0.10 m

h1 = 5mm = 0.005 m

u = -0.08 m

Lens formula: 1/v – 1/u = 1/f

1/v – 1/-0.08 = 1/0.10

1/v = 1/0.10 – 1/0.08

V = -0.4m

Image is formed 0.40 m in front of the convex lens.

m = v/u = h2/h1

-0.4/-0.08 = h2/0.005

h2 = 0.025 m = 25 mm

Image is virtual and erect

Sorry..

Answer 2

Answer:

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