Science 

What devices use lenses?

Michael Wilson

What devices use lenses?

Common optical devices that use lenses include eyeglasses, contact lenses, magnifying glasses, cameras, projectors, telescopes, binoculars, and microscopes.

How do lenses produce images?

A convex lens forms an image by refracting light rays. Light rays reflected from an object are refracted when they enter the lens and again when they leave the lens. They meet to form the image.

What are the examples of real image and virtual image?

Reflection in the mirror is the best example of a virtual image. By the intersecting rays, the real images are produced, and by diverging rays, the virtual images are produced….

Real Image Virtual Image
Example: image developed on the photographic film of a camera Example: image developed by a plane mirror

Can humans see virtual images?

We can see actual objects and real images due to the rays that are emanated from them, and virtual images due to the rays that seem to emanate from them. The rays marked in brown are (few of) the ones that get into our eye’s and help us see the object/image.

Can we photograph a real image?

Yes. Any camera that’s capable of photographing actual objects is also capable of photographing real and virtual images. If you stand in front of a mirror and take a photo, you’ll get a photo of the virtual image.

What are real and virtual objects?

A real object is one in which light rays physically emanate from the object. A virtual object is one from which light rays appear to emanate but physically do not. • A virtual image is one in which light rays do not physically intersect at the image point but appear to diverge from that point.

Which image is not obtained on screen?

virtual image

Which image does not form on screen?

Which image can be captured on screen?

For any image to be formed on a screen we need to have actual rays intersecting on the screen. Hence only real image can be taken on a screen.

What kind of image is formed on a cinema screen?

When the light rays from a source of light strike the surface of a concave mirror then it converges the light rays to a single point. Since the image formed on the cinema screen is always formed due to the actual meeting of rays, so a concave mirror is used on a cinema screen.

What image is formed in a plane mirror on a cinema screen?

(a) The type of image formed in a plane mirror is virtual. The virtual images form when the light rays appear to meet at a definite point, after reflection. (b) The type of image formed on a cinema screen is real. The real images form when the light rays meet at a particular point after reflection.

What type of image is produced by Convex mirrors?

virtual

What type of image is formed in a pinhole camera?

inverted

Physics 

What devices use lenses?

Michael Wilson

What devices use lenses?

Common optical devices that use lenses include eyeglasses, contact lenses, magnifying glasses, cameras, projectors, telescopes, binoculars, and microscopes.

What optical instruments produces a virtual image?

A simple microscope is an optical instrument, we use for the magnification of small objects to get a clear image or vision. It is a convex lens having a short focal length. This microscope is at a small distance from the object for the magnification and hence this forms a virtual image.

What are the optical instrument used in a microscope?

A microscope is an optical instrument used to view small objects by enlarging them with two convex lenses. Optical microscopes, used for research, illuminate samples with visible or ultraviolet light….Viewable objects by magnification.

Magnification Instrument Example
Approx. 400x Upright/inverted microscope Euglena

What are three common types of optical instruments?

There are three main types of optical telescopes: refractive, reflective, and catadioptric.

Which is the natural optical instrument?

The eye, the first element in the system, is a simple optical instrument. It is composed of only two positive lenses, the cornea and the crystalline lens, that project images into the retina to initiate the visual process.

Is a mirror an optical device?

A mirror is an optical device which can reflect light. Usually, however, only those devices are meant where the angle of reflection equals the angle of incidence (see Figure 1).

What is the difference between a double convex lens and a biconvex lens?

In case of double convex lens the two surfaces may have any values for the two radii of curvature of the two surfaces while in bi-convex lens the radii of curvature of the two surfaces has the same value.

What is optical Centre of lens?

: a point on the axis of a lens that is so located that any ray of light passing through it in passing through the lens suffers no net deviation and that may be within, without, or on either surface of the lens.

What is radius of curvature of convex lens?

The radius of curvature for a convex lens is 40 cm, for each surface.

What is the sign of radius of curvature?

The sign convention for the optical radius of curvature is as follows: If the vertex lies to the left of the center of curvature, the radius of curvature is positive. If the vertex lies to the right of the center of curvature, the radius of curvature is negative.

What is radius of curvature of a lens?

Definition: Radius of curvature of lens is the radius of the hollow sphere of glass of which the lens is a part. Each lens has two radii of curvature. i.e As Refractive index (m) increases focal length (f) of lens decreases.