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Which of the following statements is FALSE? 1. Focal length of a convex lens is positive. 2. Focal length of a concave lens is negative. 3. All measurements to the right of the optic centre are positive. 4. All measurements to the left of the optic centre are positive. 
 Which of the following statements is/are true of the human eye lens? Choose the correct answer from the code given below:  (i) It is a convex lens (ii) It is a concave lens (iii) It is a convex lens of variable focal length (iv) It forms a real and inverted image of a distant object at the retina
Match the following (a) Concave mirror (i) A diverging lens (b) Concave lens (ii) Magnifying glass (c) Convex mirror (iii) Dentist mirror (d) Convex lens (iv) Rear view mirror
Consider the following statement: A ray of light passing through the optical centre of a convex lens emerges without any deviation after refraction. A ray of light passing through the first principal focus of a convex lens  emerges parallel to the principal axis after refraction. A ray of light passing through the optical centre of a convex lens emerges parallel to the principal axis after refraction. Which one of the following statements INCORRECT?
The upper part of the bi-focal lens is a convex lens while its lower part is a concave lens.
A concave mirror and convex mirror are cut from same spherical glass ball but the aperture of concave mirror is more than the aperture of convex mirror. What can be said about their focal lengths?
Consider the following statements   1. The focal length of the eyepiece is larger than the focal length of the objective. 2. The focal length of the eyepiece is smaller than the focal length of the objective. 3. The aperture of the eyepiece lens is larger than the objective lens. Which of the following statements is/are INCORRECT about a compound microscope?
Which statement is correct about telescope: a) The focal length of the objective lens is more than the eyepiece. b) The focal length of the eyepiece is more than the objective lens. c) The aperture of the objective lens is more than the eyepiece. d) The aperture of the eyepiece is more than the objective lens.
A convex lens has a focal length of 10cm. At which of the following positions should an object be placed so that this convex lens may act as a magnifying glass?
Consider the following statement about the concave lens A. Magnified image cannot be obtained. B. Real and inverted image can be obtained. C. Image is always formed either on focus or focal length. D. Focal length is always negative. Which among the above statements is incorrect?