A compound microscope is an instrument which consists of two lenses `L_1 and L_2`. The lens `L_1` called objective, forms a real, inverted and magnified image of the given object. This serves as the object for the second lens `L_2`, the eye piece. The eye piece functions like a simple microscope or magnifier. It produces the final image, which is inverted with respect to the original object, enlarged and virtual.
What types of lenses must be `L_1 and L_2`?
A compound microscope is an instrument which consists of two lenses `L_1 and L_2`. The lens `L_1` called objective, forms a real, inverted and magnified image of the given object. This serves as the object for the second lens `L_2`, the eye piece. The eye piece functions like a simple microscope or magnifier. It produces the final image, which is inverted with respect to the original object, enlarged and virtual.
What types of lenses must be `L_1 and L_2`?
What types of lenses must be `L_1 and L_2`?
A
Both concave
B
Both convex
C
`L_1`- concave and `L_2`- convex
D
`L_1 `- convex and `L_2` - concave
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A convex lens forms a real and inverted image of an object. The size of the image is the same as that of the object . Where is the object placed ?
A virtual, erect and magnified image of an object is to be obtained with a convex lens. For this purpose, the object should be placed:
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A concave lens of focal length (1)/(3)m forms a real, inverted image twice in size of the object. The distance of the object from the lens is
A concave lens of focal length (1)/(3)m forms a real, inverted image twice in size of the object. The distance of the object from the lens is
A
`0.5 m`
B
`0.166m`
C
`0.33 m`
D
`1m `
When an object is placed in front of a converging lens, a magnified erect image is formed. The distance of the object from the lens will be:
When an object is placed in front of a converging lens, a magnified erect image is formed. The distance of the object from the lens will be:
A
Equal to two focal lengths
B
Between one and two focal lengths
C
Equal to one focal length
D
Less than one focal length
A convex lens of focal length f will form a magnified real image of an object if the object is placed
A convex lens of focal length f will form a magnified real image of an object if the object is placed
A
anywhere beyond 2f
B
anywhere beyond f
C
between f and 2f
D
between lens and f
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Draw a ray diagram to show image formation when the concave mirror produces a real inverted and magnified image of the object
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Read the paragraph and answer the questions given below it: Construction of a compound microscope : (1) A compound microscope consists of a metal tube fitted with two convex lenses at the two ends. These lenses are called the objective lens (the lens directed towards the object) and the eyepiece (the lens directed toward the eye). Both thhe lenses are small in size, but the cross section of the objective lens is less than that of the eyepiece. The objective lens has a short focal length. The focal length of the eyepiece is more than that of the objective lens. (2) The metal tube is mounted on a stand. The principle axes of the objective lens and the eyepiece are along the same line. The distance between the object and the objective lens can be changed with a screw. It is possible to change the distance between the objective lens and the eyepiece. Working : (1) The object to be observed is illuminated and placed in front of the objective lens, slightly beyond the focal length of hte objective lens. Its real, invertes and enlarged image is formed by the objective lens on the other side. (2) This intermediate image lies within the focal length of the eyepiece. It serves as an object for the oyepiece. The oyepiece works as a simple micrroscope. The final image is virtual, highly enlarged and inverted with respect to the original object. It can be formed at the minimum distance of distinict vision from the eyepiece. The final image is observed by keeping the oye close to the eyepice. Use: This microscope is uded to observe blood cells, microorganisms, sec. State the nature of the final image in a compound microscope relative to the object.
Read the paragraph and answer the questions given below it: Construction of a compound microscope : (1) A compound microscope consists of a metal tube fitted with two convex lenses at the two ends. These lenses are called the objective lens (the lens directed towards the object) and the eyepiece (the lens directed toward the eye). Both thhe lenses are small in size, but the cross section of the objective lens is less than that of the eyepiece. The objective lens has a short focal length. The focal length of the eyepiece is more than that of the objective lens. (2) The metal tube is mounted on a stand. The principle axes of the objective lens and the eyepiece are along the same line. The distance between the object and the objective lens can be changed with a screw. It is possible to change the distance between the objective lens and the eyepiece. Working : (1) The object to be observed is illuminated and placed in front of the objective lens, slightly beyond the focal length of hte objective lens. Its real, invertes and enlarged image is formed by the objective lens on the other side. (2) This intermediate image lies within the focal length of the eyepiece. It serves as an object for the oyepiece. The oyepiece works as a simple micrroscope. The final image is virtual, highly enlarged and inverted with respect to the original object. It can be formed at the minimum distance of distinict vision from the eyepiece. The final image is observed by keeping the oye close to the eyepice. Use: This microscope is uded to observe blood cells, microorganisms, sec. In a compound microscope, which lens which lens has greater focal length?
Read the paragraph and answer the questions given below it: Construction of a compound microscope : (1) A compound microscope consists of a metal tube fitted with two convex lenses at the two ends. These lenses are called the objective lens (the lens directed towards the object) and the eyepiece (the lens directed toward the eye). Both thhe lenses are small in size, but the cross section of the objective lens is less than that of the eyepiece. The objective lens has a short focal length. The focal length of the eyepiece is more than that of the objective lens. (2) The metal tube is mounted on a stand. The principle axes of the objective lens and the eyepiece are along the same line. The distance between the object and the objective lens can be changed with a screw. It is possible to change the distance between the objective lens and the eyepiece. Working : (1) The object to be observed is illuminated and placed in front of the objective lens, slightly beyond the focal length of hte objective lens. Its real, invertes and enlarged image is formed by the objective lens on the other side. (2) This intermediate image lies within the focal length of the eyepiece. It serves as an object for the oyepiece. The oyepiece works as a simple micrroscope. The final image is virtual, highly enlarged and inverted with respect to the original object. It can be formed at the minimum distance of distinict vision from the eyepiece. The final image is observed by keeping the oye close to the eyepice. Use: This microscope is uded to observe blood cells, microorganisms, sec. State which distance is adjusted to observe the object with a compound microscope.
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