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COMBINATION OF LENSES...

COMBINATION OF LENSES

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Shashank went to the optician to get his eyes checked. He observed that the doctor combined two lenses and put these in front of his eyes so that he could see clearly. The powers of the two lenses used in the combination were -3 D and 4 D. What type of lens will the combination of lenses be?

Shashank went to the optician to get his eyes checked. He observed that the doctor combined two lenses and put these in front of his eyes so that he could see clearly. The powers of the two lenses used in the combination were -3 D and 4 D. Which of these will be the focal length of the combination of lenses Shashank has to wear?

Combination of two convex lenses works always as .......

Obtain the equivalent focal length of combination of thin lenses placed in contact,

Shashank went to the optician to get his eyes checked. He observed that the doctor combined two lenses and put these in front of his eyes so that he could see clearly. The powers of the two lenses used in the combination were -3 D and 4 D. Which of the two lenses can form a real image?

Two lenses of power +15 and - 5D are in contact with each other forming a combination lens.(a) What is the focal length of this combination? (b) An object of size 3 cm is placed at 30 cm from this combination of lenses. Calculate the position and size of the image formed.

A point ofject 'O' lies in front of the lens as shown in figure. Find the final position of image formed by the combined lenses.