a virtual image
Very Short Answer Questions:
Give one example of a virtual image.
2 which type of lens is known as diverging lens?
3. Which type of image forms when the reflected rays actually meet?
4. Which surface of a spoon always forms an erect image of your face?
5. Which lens is used in Galilean telescopes?
6. Which lens is used in magnifying glass?
Answers
Answer:
2.Also known as divergent lens, negative lens, concave lens or dispersive lens. A lens that causes parallel light rays to spread out – hence diverge – away from the optical axis once exiting the lens.
3.An image formed by reflection may be real or virtual. A “real” image occurs when light rays actually intersect at the image, and become inverted, or turned upside down. A “virtual” image occurs when light rays do not actually meet at the image. Instead, you “see” the image because your eye projects light rays backward.
4.The outer surface of the spoon always forms an erect image of our face as it is a convex mirror.
5.The design Galileo Galilei used in 1609 is commonly called a Galilean telescope. It used a convergent (plano-convex) objective lens and a divergent (plano-concave) eyepiece lens (Galileo, 1610). A Galilean telescope, because the design has no intermediary focus, results in a non-inverted and upright image.
6.convex lens
Answer:
Explanation:
1. A virtual image (as opposed to a real image) is produced by an optical system (a combination of lenses and/or mirrors) when light rays from a source do not cross to form an image. Instead they can be 'traced back' to a point behind the lens or mirror.
2. Also known as divergent lens, negative lens, concave lens or dispersive lens. A lens that causes parallel light rays to spread out – hence diverge – away from the optical axis once exiting the lens.
3. An image formed by reflection may be real or virtual. A “real” image occurs when light rays actually intersect at the image, and become inverted, or turned upside down. A “virtual” image occurs when light rays do not actually meet at the image. Instead, you “see” the image because your eye projects light rays backward.
4. The outer surface of the spoon always forms an erect image of our face as it is a convex mirror
5. The design Galileo Galilei used in 1609 is commonly called a Galilean telescope. It used a convergent (plano-convex) objective lens and a divergent (plano-concave) eyepiece lens (Galileo, 1610). A Galilean telescope, because the design has no intermediary focus, results in a non-inverted and upright image.
6. A magnifying glass is a convex lens used to make an object appear much larger than it actually is. This works when the object is placed at a distance less than the focal length from the lens.
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