a spherical mirror and a thin spherical lens have each a focal length of -15cm the mirror and a lens are likely to be both convex why ?
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The focal length of a spherical mirror = - 15 cm
Then it is a concave mirror. Because the direction of focus from the pole of the mirror is in the direction opposite to that of the light rays from the object.
Focal length of a spherical lens = - 15 cm
Then the lens is equivalent to a biconcave lens. This is because the direction of the principal focus is opposite to the direction of the light rays from the object.
This is due to the sign convention chosen by scientists and physicists.
Then it is a concave mirror. Because the direction of focus from the pole of the mirror is in the direction opposite to that of the light rays from the object.
Focal length of a spherical lens = - 15 cm
Then the lens is equivalent to a biconcave lens. This is because the direction of the principal focus is opposite to the direction of the light rays from the object.
This is due to the sign convention chosen by scientists and physicists.
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The focal length of a spherical mirror = - 15 cm
Then it is a concave mirror. Because the direction of focus from the pole of the mirror is in the direction opposite to that of the light rays from the object.
Focal length of a spherical lens = - 15 cm
Then the lens is equivalent to a biconcave lens. This is because the direction of the principal focus is opposite to the direction of the light rays from the object.
This is due to the sign convention chosen by scientists and physicists.
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