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A 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 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 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 6 cm tall object is placed on the principal axis of a convex lens. The distance of the object from the optical centre of the lens in 15 cm and its sharp image is the formed at a distance of 30 cm from it on a screen placed on other 1 AnswerList four precautions which a student should observe while ;determining the focal length of the given convex lens by obtaining of a distant object on a screen. 0 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 AnswerA convex lens forms a real and inverted image of a needle at a distance of 50 cm from it. Where is the needle placed in front of the convex lens if the image is equal to the size of the object? Also, find the power of the lens. -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 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 Answer“A lens can f orm a magnified erect image as well as magnified inverted image of an object placed in front of it ” . State the nature of this lens and draw ray diagrams to justify the above statement. Mark the positions of O, F and 2F in the dia1 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 AnswerA 2.0 cm tall object is placed perpendicular to the principal axis of a convex lens of focal length 10 cm. The distance of the object from the lens is 15 cm. Find the nature, position and size of the image. Also find its magnification. -CBSE Physics1 Answer How will the strength of the magnetic field change when the point where magnetic field is to be determined is moved away from the straight wire carrying constant current? Justify your answer. 0 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 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 concave lens of focal length 15 em forms an image 10 em from the lens. Calculate -2008 CBSE Physic class 101 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 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 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 Answer