Bai 6 huong dan thtn ve su tao anh qua he thau kinh (1)

PATH OF RAYS IN A SINGLE LENS

REFLEX CAMERA

(P 36 01)

Apparatus:

GSN 246 Adhesive magnetic 1

POG 465 Ray box, 6V 20 W 1

POG 462 Diaphragm 3 and 5 slits 1

POG Plan-convex lens model 1

POG Prism, right angle 1

POG 110 Plane mirror 1

Connecting lead 2

KAL Power supply 1

Whiteboard marker 1

Ruler 1

 A lamp projecting three parallel rays of light is set up near the left-hand edge of

the panel. This arrangement symbolizes the light reflected from a remote

object.

 The plan convex lens is set up as shown in the figure. This symbolizes the

objective lens of the camera. When the camera is focused properly, the remote

object is projected as a virtually sharp point on the photographic film.

 The position of the film is drawn in.

 The view-finder is used to locate the desired image. The technique used in the

case of the single lens reflex camera is shown.

Before reaching the film, the light rays entering are reflected upwards by a

plane

mirror inclined at an angle of 45and then refracted toward the observer's eye

by a totally reflecting prism.

 To demonstrate this, the right-angled prism with equal sides is applied as

shown in the figure. The plane mirror is placed so that the light rays are

reflected upwards and totally reflected at the hypotenuse of the inverting prism

(see figure).

When the diaphragm is released, the plane mirror flips out of the way, allowing

the light rays projected by the object to reach the film.

Optics Panel Type | 1