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JEE Advanced
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The real image which is exactly equal to the size of an object is to be obtained on a screen with the help of a convex lens of focal length 15 cm. For this, what must be in the distance between the object and screen?

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Important Questions on Geometric Optics

HARD
JEE Advanced
IMPORTANT
Complete Study Pack for Engineering Entrances Objective Physics Vol 2>Chapter 7 - Geometric Optics>Objective Problems [Level 1]>Q 66
The focal length of a converging lens is measured for violet, green and red colours. It is respectively fv, fg, fr. We will find that
MEDIUM
JEE Advanced
IMPORTANT
Complete Study Pack for Engineering Entrances Objective Physics Vol 2>Chapter 7 - Geometric Optics>Objective Problems [Level 1]>Q 67
A double convex thin lens made of glass (refractive index μ=1.5) has both radii of curvature of magnitude 20 cm. Incident light rays parallel to the axis of the lens will converge at a distance L such that
EASY
JEE Advanced
IMPORTANT
Complete Study Pack for Engineering Entrances Objective Physics Vol 2>Chapter 7 - Geometric Optics>Objective Problems [Level 1]>Q 68
A convex lens has a focal length of 20 cm. It is used to form an image of an object placed 15 cm from lens. The image is
MEDIUM
JEE Advanced
IMPORTANT
Complete Study Pack for Engineering Entrances Objective Physics Vol 2>Chapter 7 - Geometric Optics>Objective Problems [Level 1]>Q 69
At what distance from a convex lens of focal length 30 cm an object should be placed, so that the size of image be 1/4th of the object?
EASY
JEE Advanced
IMPORTANT
Complete Study Pack for Engineering Entrances Objective Physics Vol 2>Chapter 7 - Geometric Optics>Objective Problems [Level 1]>Q 70
In a plano-convex lens the radius of curvature of convex surface is 10 cm and the focal length of the lens is 30 cm. The refractive index of the material of the lens will be
HARD
JEE Advanced
IMPORTANT
Complete Study Pack for Engineering Entrances Objective Physics Vol 2>Chapter 7 - Geometric Optics>Objective Problems [Level 1]>Q 71
A convex lens forms an image of an object on a screen 30 cm from the lens. When the lens is moved 90 cm towards the object, the image is again formed on the screen. Then the focal length of the lens is
EASY
JEE Advanced
IMPORTANT
Complete Study Pack for Engineering Entrances Objective Physics Vol 2>Chapter 7 - Geometric Optics>Objective Problems [Level 1]>Q 72
An object has image thrice of its original size when kept at 8 cm and 16 cm from a convex lens. Focal length of the lens is
EASY
JEE Advanced
IMPORTANT
Complete Study Pack for Engineering Entrances Objective Physics Vol 2>Chapter 7 - Geometric Optics>Objective Problems [Level 1]>Q 73
A converging lens is used to form an image on a screen. When the upper half of the lens is covered by an opaque screen, then