The ‘f is negative when the image formed is real and T is positive when the image formed is virtual.Question 17: When parallel beams fall on a convex lens, what happens? Answer: It converges at focus of the convex lens.Question 18: When light passes through optical centre of a convex...
Since as object is always placed to the left side of a mirror, therefore, the object distance (u) is always negative. ... If the image is formed behind a concave mirror, the image distance (v) is positive but if the image is formed in front of the mirror , then the image distance...
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These lenses have a convex and a concave surface, and they can be positive or negative lenses. Crescent lens Meniscus lens A crescent lens is usually used together with another lens in composite optical assemblies. When used in this structu...
These lenses have a convex and a concave surface, and they can be positive or negative lenses. Crescent lens Meniscus lens A crescent lens is usually used together with another lens in composite optical assemblies. When used in this ...
Answer to: The image produced by a convex mirror is always closer to the mirror than it would be in a plane mirror for the same object distance...
(a) The linear magnification of a concave lens is always positive. Why? (b) The linear magnification of a convex lens may be positive or negative. Why ? View Solution Magnification produced by a concave lens is always: View Solution How will you distinguish between a plane mirror, a conv...
Cylinder Lenses are offered in both plano-concave and plano-convex configurations, they are typically used to focus incoming light to a line, or to change the aspect ratio of an image. Cylinder Lenses are available with positive or negative focal lengths, they are used for the optics, lasers...
Since the magnification can be positive or negative, we will consider two cases: 1. When the image is real (magnification is negative).2. When the image is virtual (magnification is positive). Case 1: Real ImageFor a real image, we have:m=−2⟹v=−2u...
where m is called the magnification or, sometimes, the transverse magnification; m is negative for a positive lens projecting a real image. It is sometimes convenient to write the object and image distances l′ and l in terms of the focal lengths f′ and f, and the magnification m: (4)...