Physics [1 Mark Question Answer]

How are the distance of object (u), the distance of image (v), and focal length (f) of a lens-related?

How is the magnification (m) produced by a lens related to the object distance (u) and the image distance (v)?

A convex lens produces on a screen an image twice the size of the object. If the position of image and object be interchanged, what will be the magnification then?

Name the lens for which magnification is always less than 1.

Name the lens for which magnification can be 1. For what position of the object will the magnification be 1?

What information we seek by the linear magnification of the image when it is positive or negative?

Will the image formed by a magnifying glass be real or virtual?

Why is the focal length of the lens, used as a magnifying glass, kept short?

Name the lens used as a magnifying glass.

Which lens can produce a real and inverted image of an object?

State the nature and position of the object on the principal axis to obtain. A virtual and diminished image.

State three characteristics of the image of an extended source, formed by a concave lens.

A lens forms an erect, magnified and virtual image of an object. name the type of lens.

We can burn a piece of paper by focussing the sun rays by using a particular type of lens. Name the type of lens used for the above purpose.

State the nature and position of the object on the principal axis to obtain a real image of the same size

State the nature and position of the object on the principal axis to obtain a virtual and magnified image.

State the nature and position of the object on the principal axis to obtain a real and magnified image.

State the position of object, position of image, nature of image when: Convex lens is used in observing biological specimens.

State the position of object, position of image, nature of image when: Convex lens is used as in searchlight.

State the position of object, position of image, nature of image when: Convex lens is used in cine projector.

What happens to the image formed by a convex lens if its lower part is blackened?

State the position of object, position of image, nature of image when: Convex lens is used as an erecting lens in terrestrial telescope.

State the position of object, position of image, nature of image when: Convex lens is used as objective lens of photographic camera.

Name the subjective property of light related to its wavelength.

What is lens?

From the nature of the refracted rays, shown in the diagram interpret the nature of the lens represented by the dotted line.

From the nature of the refracted rays, shown in the diagram interpret the nature of the lens represented by the dotted line.

We can burn a piece of paper by focussing the sun rays by using a particular type of lens. Name the type of lens used for the above purpose. Draw a ray diagram to support your answer.

An object is placed in front of a convex lens such that the image formed has the same size as that of the object. Draw a ray diagram to illustrate this.

A stick partly immersed in water appears to be bent. Draw a ray diagram to show the bending of the stick when placed in water and viewed obliquely from above.

What is the path of the ray, after refraction, that passes through the first focus of the lens?

Draw a ray diagram to illustrate the determination of the focal length of a convex lens using an auxiliary plane mirror.

A candle is placed between f and 2f a convex lens. Draw a ray diagram showing the position of the image.

An object is placed in front of a lens between its optical centre and the focus and forms a virtual, erect, and diminished image. Draw a ray diagram to show the formation of the image with the above-stated characteristics.

Figure shows the transmitted rays through lens kept in a box. Draw the lens and complete the path of ray

Figure show the incident rays through the lens kept in a box. Draw the lens and complete the path of rays.

Define the focal length.

Copy and complete the following ray diagram.

Copy and complete the following ray diagram.