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a converging lens

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Important Questions on Refraction through Lens

EASY
An object is placed at a distance 24 cm in front of a convex lens of focal length 8 cm. What is the nature of the image so formed?
EASY
If F be the focal length of a convex lens, then the nature of image of an object placed at a distance 2F will be :
MEDIUM

A student wants to obtain magnified image of an object AB as on a screen. Which one of the following arrangements shows the correct position of AB for him/her to be successful?

EASY
State the position of the object in front of a converging lens if It is used as a magnifying lens.
MEDIUM

An object is placed between the optical centre and the focus of a thin convex lens. What is the nature of the image of the object?

EASY
State the position of the object in front of a converging lens if It produces a real and same size image of the object.
HARD
If an object is placed at the focus of a convex lens, its image is
HARD

An object AB is placed between O and F1 on the principal axis of a converging lens as shown in the diagram.

Question Image

Copy the diagram and by using three standard rays starting from point A, obtain an image of the object AB.

EASY
Where should an object be placed in front of a convex lens to get a real image of the size of the object? 
EASY
The complete ray diagram for ____ Question Image
HARD
A convex lens forms a real and inverted image of a needle at a distance of 50 cm from it. Where is the needle placed in front of the convex lens if the image is equal to the size of the object? Also, find the power of the lens.
EASY
A full-length image of a distant tall building can definitely be seen by using
MEDIUM
An object 5 cm in length is held 25 cm away from a converging lens of focal length 10 cm. Draw its ray diagram. 
HARD

A virtual, diminished image is formed when an object is placed between the optical centre and the principal focus of a lens.
(i) Name the type of lens which forms the above image.
(ii) Draw a ray diagram to show the formation of the image with the above stated characteristics.  

HARD
A 20 mm tall object is placed perpendicular to the principal axis of a convex lens of focal length 10 cm. If the distance of the object from the lens is 15 cm, then find the natures position and size of the image.
HARD
A concave lens has focal length of 15 cm. At what distance should the object from the lens be placed so that it forms an image at 10 cm from the lens? Also find the magnification and nature of the image produced by the lens. 
EASY

Where will you keep an object in front of a convex lens in order to get a virtual and magnified image?

EASY
The central point of a lens is known as:
EASY

Which of the following lenses would you prefer to use while reading very small letters?

EASY
Where should an object be placed in front of a convex lens to get a real image of the size of the object?