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### The radius of curvature of a convave mirror is 24 cm and the imager is magnified

The radius of curvature of a concave mirror is 24 cm and the imager is magnified by 1.5 times. The object distance is

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(a) 20 cm (b) 8 cm (c) 16 cm […]

### The focal length of the objective of a terrestrial telescope is 80 cm

The focal length of the objective of a terrestrial telescope is 80 cm and it is adjusted for parallel rays, then its power is 20. If the focal length of erecting lens is 20 cm, […]

### An object is placed at a distance of 10 cm from a co-axial combination of two lenses

An object is placed at a distance of 10 cm from a co-axial combination of two lenses A and B in contact. The combination forms a real image three times the size of the object. […]

### A short linear object of length L lies on the axis of a spherical mirror of focal

A short linear object of length L lies on the axis of a spherical mirror of focal length f at a distance u form the mirror. Its image has an axial length L’ equal to […]

### In a compound microscope, the focal length of the objective is 2.5 cm and of eye lens

In a compound microscope, the focal length of the objective is 2.5 cm and of eye lens is 5 cm. If an object is placed at 3.75 cm before the objective and the image is […]

### If the image formed by a convex mirror of focal length 30 cm is a quarter of the size

If the image formed by a convex mirror of focal length 30 cm is a quarter of the size of the object, then the distance of the object from the mirror will be

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### A concave mirror of focal length f₁ is placed at a distance d from a convex lens

A concave mirror of focal length f₁ is placed at a distance d from a convex lens of focal length f₂. A beam of light coming from infinity and falling on this convex lens concave […]

### A ray of light is incident at an angle of incidence i, on one face of a prism

A ray of light is incident at an angle of incidence i, on one face of a prism of angle A (assumed to be small) and emerges normally from the opposite face. If the refractive […]

### The diameter of the eye ball of a normal eye is about 2.5 cm. The power of the eye

The diameter of the eye ball of a normal eye is about 2.5 cm. The power of the eye lens varies from

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(a) 9 D to 8 D (b) 40 D to 32 […]

### For having large magnification power of a compound microscope

For having large magnification power of a compound microscope

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(a) length of the microscope tube must be small (b) focal lengths of objective lens and eye-piece should be large. (c) focal lengths […]

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