A convex lens of power +4 D and a concave lens of power 3 D are placed in contact. What is equivalent power of the combination?

Q: A convex lens of power +4 D and a concave lens of power 3 D are placed in contact. What is…

A: Power of convex lens:- The power of a lens is defined as the reciprocal of the focal length. Lense…

Q: Consider a camera whose lens has a 41 mm focal length.   What is the power P, in diopters, of the…

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Q: A telescope is made of an object glass of focal length 20 cm and an eyepiece of 5 cm, both…

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Q: A weird man uses a converging lens with focal length 26 cm to view a weird picture 15 cm in front of…

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Q: A thin convex lens of focal length 5 cm is used as a simple microscope by a person with normal near…

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Q: If f=+150mm (lens), what kind of lens is it? Convex or concave?

A: Focal length is the distance over which the parallel rays of light either converge or diverge. For a…

Q: A near-sighted person has a far point of 71 cm. (a) What is the focal length (with its sign), in…

A: near point = 71 cm least distance of distinct vision = 25 cm distance between eye and glasses = 2 cm…

Q: Let us assume that the farthest object a certain myopic eye can properly focus is 4 m from the eye.…

A: As mentioned the myopic eye can focus up to 4m from the eye, thus the lens used to focus must be…

Q: Make a diagram to show how hypermetropia is corrected. The near point of a hypermetropic eye is 1 m.…

A: A person with hypermetropia can see distant objects clearly but not near by objects. It is called as…

Q: A stamp collector uses a converging lens with focal length 28 cm to view a stamp 18 cm in front of…

A: A converging lens is also known as a convex lens For a convex lens 1v-1u=1f magnification M =vu…

Q: What should be the optical power and the focal length of the diverging lens so that the image of an…

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Q: An eye specialist prescribes spectacles having combination of convex lens of focal length 40 cm in…

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Q: A person has far and near points of 84 cm and 15 cm, respectively. What is the percent change in the…

A: Given : far point of eye of person, u1 = - 84 cm = 0.84 m ( distance of far object)            near…

Q: The distance an object is from a diverging lens is changed by a factor of 5.8, by what factor does…

A: Given: distance of an object is changed by a factor of 5.8  Find : By what factor does the angular…

Q: What is the magnification of a lens if it makes an object that is 10 mm high appear to be 150 mm…

A: Height of object, ho=10 mm Height of image, hi=150 mm Let magnification be m.

Q: For a lens of focal length f, what value of do would give an image with a magnification of one?

A: lens formula says1f=1di-1dof = focal lengthdo=object distancedi=image distancemagnification, m…

Q: What is the difference between a concave and convex lens? Provide applications for each.

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Q: Two lenses of power 3 D and -1 D are kept in contact. What is focal length and nature of combined…

A: Given data:  Power of lens 1 (P1) = 3 D Power  of lens 2 (P2) = -1 D Required: Focal length and…

Q: A pair of binoculars has an angular magnification of -5.5, when acting as a telescope (in most…

A: The angular magnification M of binoculars is defined as, M = fo / fe where fo is the effective focal…

Q: What is the focal length of a convex lens of focal length 30cm in contact with a concave lens of…

A: Given:  f1 = + 30 cm  f2 = - 20 cm

Q: What is the net power of the near vision correction?

A: Given data:   The power of the diverging lens is: P1 The power of the converging lens is: P2 The…

Q: Two converging lenses, both with focal lengths 34.5 cm are placed a distance 78.3 cm apart. An…

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