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A student obtains a sharp image of the distant window (W) of the school laboratory on the screen ( S ) using the given concave mirror (M) to determine its focal length. Which of the following distances should he measure to get the focal 1 AnswerA student used a device (X) to obtain/focus the image of a well illuminated distant building on a screen ( S ) as shown below in the diagram. Select the correct statement about the device (X). CBSE- class10- Science 20151 Answer An object of size 7.0 cm is placed at 27 cm in front of a concave mirror of focal length 18 cm. At what distance from the mirror should a screen be placed, so that a sharp focussed image can be obtained? Find the size and the nature of the image. -C1 AnswerAn object, 4.0 cm in size, is placed at 25.0 cm in front of a concave mirror of focal length 15.0 cm. At what distance from the mirror should a screen be placed in order to obtain a sharp image? Find the nature and the size of the image. -CBSE Physic1 AnswerA student obtained a sharp inverted image of a distant tree on the screen placed behind a convex lens. He then removed the screen and tried to look through the lens in the direction of the object. He would now observe: CBSE class10 Science 20161 AnswerWhile determining the focal l ength of a concave mirror, you try to focus the image of a distant object formed by the mirror on the screen. The image formed on that screen, as compared to the object , should be : CBSE class10 Scienc1 AnswerA student focuses the image of a candle flame, placed at about 2 m from a convex lens of focal length 10 cm, on a screen. After that he moves gradually the flame towards the lens and each time focuses its image on the screen. CBSE- cl1 AnswerA student obtains a blurred image of a distant object on a screen using a convex lens. To obtain a distinct image on the screen he should move the lens. CBSE- class10- Chemistry 20171 AnswerStudy the given ray diagrams and select the correct statement from the following: CBSE- class10- Chemistry 20171 AnswerA concave lens has focal length of 20 cm. At what distance from the lens a 5 cm tall object be placed so that it forms an image at 15 cm from the lens ? Also calculate the size of the image formed -2007 CBSE Physic class 101 AnswerA convex lens of focal length 25 cm and a concave lens of focal length 10 cm are placed in close contact with each other. Calculate the lens power of this combination. - 2008 CBSE Physic class 101 Answer An object is placed at a distance of 10 cm from a convex mirror of focal length 15 cm. Find the position and nature of the image. -CBSE Physics1 AnswerWhat is the focal length of a plane mirror? Which mirror has larger field of v iew – concave or convex? Where is this property of the mirror used? CBSE class10 Science 20161 Answer A concave lens of focal length 15 em forms an image 10 em from the lens. Calculate -2008 CBSE Physic class 101 Answer A concave lens of focal length 15 cm forms an image 10 cm from the lens. How far is the object placed from the lens? Draw the ray diagram. -CBSE Physics1 Answer A 5.0 cm tall object is placed per pendicular to the principal axis of a convex lens of focal length 20 cm. The distance of the object from the lens is 30 cm. By calculation determine (i) the position, and (ii) the size of the image formed. - 2006 1 AnswerA concave lens has focal length of 15 cm. At what distance should the object from the lens be placed so that it forms an image at 10 cm from the lens? Also, find the magnification produced by the lens. -CBSE Physics1 AnswerA concave lens has focal length of 15 cm. At what distance should the object from the lens be placed so that it forms an image at 10 cm from the lens? Also, find the magnification produced by the lens. -CBSE Physics1 AnswerFind the power of a concave lens of focal length 2 m. -CBSE Physics1 AnswerThe image of a candle flame placed at a distance of 45 cm from a spherical lens is formed on a screen placed at a distance of 90 cm from the lens. Identify the type of lens and calculate its focal length. If t he height of the flame is 2 cm, f ind 1 Answer