MyQuestionIcon

1

You visited us 1 times! Enjoying our articles? Unlock Full Access!

Focus of a Convex Lens

94.Tw o conve...

Question

94.Tw o converging lenses with focal lengths f and 2f are positioned at a distance 3f apart.A parallel beam of light is incident on the lens with focal length f.If d is the incident beam width,what is the width of the emerging beam?

Open in App

Solution

Suggest Corrections

thumbs-up

0

Similar questions

Q. A convex lens of focal length

1.0 c m

and a concave lens of focal length

0.25 m

0.75 m

apart. A parallel beam of light is incident on the convex lens. The beam emerging after refracting from both lenses is

Q. A convex lens of focal length 20 cm and a concave lens of focal length 10 cm are placed 10 cm apart with their principal axes coinciding. A beam of light travelling parallel to the principal axis and having a beam diameter 5.0 mm, is incident on the combination. Show that the emergent beam is parallel to the incident one. Find the beam diameter of the emergent beam.

Q. A convex lens of focal length

20 c m

and a concave lens of focal length

f

are mounted coaxially

5 c m

apart. Parallel beam of light incident on the convex lens emerges from the concave lens as a parallel beam. Then,

f

Q. A converging lens of focal length

f_{1}

is placed in front of and coaxially with a convex mirror of focal length

f_{2}

. Their separation is

d

. A parallel beam of light incident on the lens returns as a parallel beam from the arrangement.

Q. A thin convex lens

(L_{1})

of focal length

80

cm and a thin concave lens

(L_{2})

of focal length f are kept co-axially,

20

cm apart as shown in figure. When a narrow and parallel beam of light is incident on the convex lens, beam emerging from the concave lens is also a parallel beam. Find f.

Join BYJU'S Learning Program

similar_icon

Related Videos

lock

Focus of a convex lens_tackle

PHYSICS

Watch in App

explore_more_icon

Explore more

Focus of a Convex Lens

Standard IX Physics

Join BYJU'S Learning Program

CrossIcon