An erect and enlarged image of an object is formed on a screen. Explain how this could be possible.

Academic Physics NCERT Class 7

An erect and enlarged image of an object can be obtained on a screen if the object is placed upside down between principal focus and twice the length of principal focus of the convex lens.

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Updated on: 10-Oct-2022

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Name the mirror which can give:(a) an erect and enlarged image of an object.(b) an erect and diminished image of an object.
When an object is kept within the focus of a concave mirror, an enlarged image is formed behind the mirror. This image is:(a) real (b) inverted (c) virtual and inverted (d) virtual and erect
Fill in the blanks:$(a)$. An image that cannot be obtained on a screen is called ____________.$(b)$. Image formed by a convex __________ is always virtual and smaller in size.$(c)$. An image formed by a __________ mirror is always of the same size as that of the object.$(d)$. An image that can be obtained on a screen is called a _________ image.$(e)$. An image formed by a concave ___________ cannot be obtained on a screen.
Can an image formed by a plane mirror be obtained on screen?
An image formed by a lens is erect. Such an image could be formed by a$(a)$. convex lens provided the image is smaller than object.$(b)$. concave lens provided the image is smaller than object.$(c)$. concave lens provided the image is larger than object.$(d)$. concave lens provided the image is of the same size.
The image seen in a plane mirror cannot be formed on a screen. What name is given to this type of image?
An erect and enlarged image can be formed by$(a)$. only a convex mirror.$(b)$. only a concave mirror.$(c)$. only a plane mirror.$(d)$. both convex and concave mirrors.
Show by drawing a ray-diagram that the image of an object formed by a concave lens is virtual, erect and diminished.
Which mirror always produces a virtual, erect and diminished image of an object?
With the help of a labelled ray diagram, describe how a converging mirror can be used to give an enlarged upright image of an object.
When an object is kept at any distance in front of a concave lens, the image formed is always:(a) virtual, erect and magnified (b) virtual, inverted and diminished(c) virtual, erect and diminished (d) virtual, erect and same size as object
An image formed on a screen is three times the size of the object. The object and screen are 80 cm apart when the image is sharply focussed.(a) State which type of lens is used.(b) Calculate focal length of the lens.
What kind of lens can form:(a) an inverted magnified image?(b) an erect magnified image?(c) an inverted diminished image?(d) an erect diminished image?
State whether the following statements are True or False.$(a)$. A concave lens can be used to produce an enlarged and erect image.$(b)$. A convex lens always produces a real image.$(c)$. The sides of an object and its image formed by a concave mirror are always interchanged.$(d)$. Art object can be seen only if it emits light.
State where an object must be placed so that the image formed by a concave mirror is:(a) erect and virtual.(b) at infinity.(c) the same size as the object.

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