Four students A, B, C and D did their experiment on finding the focal

1.	Four students A, B, C and D did their experiment on finding the focal length of convex lens by obtaining the image of a distant object as follows: Student A used the window grill in the laboratory as the object and a white paper sheet held in hand, as the screen. Student B used a distant tree in absence of sunlight as the object, and a white thick board held on a stand, as the screen. Student C used a well illuminated laboratory window grill as the object and a white paper sheet held on a stand as the screen. Student D used a well illuminated distant tree as the object and a white thick board held on a stand, as the screen. Arrange these techniques in order of decreasing accuracy in measurement.
Answer» Four students A, B, C and D did their experiment on finding the focal length of convex lens by obtaining the image of a distant object as follows: Student A used the window grill in the laboratory as the object and a white paper sheet held in hand, as the screen. Student B used a distant tree in absence of sunlight as the object, and a white thick board held on a stand, as the screen. Student C used a well illuminated laboratory window grill as the object and a white paper sheet held on a stand as the screen. Student D used a well illuminated distant tree as the object and a white thick board held on a stand, as the screen. Arrange these techniques in order of decreasing accuracy in measurement.

Four students A, B, C and D did their experiment on finding the focal length of convex lens by obtaining the image of a distant object as follows: Student A used the window grill in the laboratory as the object and a white paper sheet held in hand, as the screen. Student B used a distant tree in absence of sunlight as the object, and a white thick board held on a stand, as the screen. Student C used a well illuminated laboratory window grill as the object and a white paper sheet held on a stand as the screen. Student D used a well illuminated distant tree as the object and a white thick board held on a stand, as the screen. Arrange these techniques in order of decreasing accuracy in measurement.

Answer»

Four students A, B, C and D did their experiment on finding the focal length of convex lens by obtaining the image of a distant object as follows:
Student A used the window grill in the laboratory as the object and a white paper sheet held in hand, as the screen.
Student B used a distant tree in absence of sunlight as the object, and a white thick board held on a stand, as the screen.
Student C used a well illuminated laboratory window grill as the object and a white paper sheet held on a stand as the screen.
Student D used a well illuminated distant tree as the object and a white thick board held on a stand, as the screen.

Arrange these techniques in order of decreasing accuracy in measurement.

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