For correction of which defects in vision of eye spectacles of convex and concave lenses are useD?

For correction of which defects in vision of eye spectacles to convex and concave lenses and used

Convex lenses correct.

Which type of defect of vision is rectified a convex lens?

Two lenses, one convex and the other concave are kept in contact. The focal length of convex lens is 30cm and that of concave lens is 20 cm. Whaat will be the equibalent focal length of the combination? What will be the nature of the combination?

A person is wearing spectacles with concave lenses for correcting vision. While not using the glasses, the image of a distant object in his case will be formed

Identify the correct pair of characters of a bacterium which is useful in production of methane (i) Recyclers of inorganic nutrients (ii) Present in stomach of cattle (iii) Obtain energy from sunlight (iv) Aerobes

In genetic engineering, a DNA segment (gene) of interest, is translated to the host cell through a vector. Consider the following four agents (A-D) in this regard and select the correct option about which one or more of these can be used as a vector/vectors Statement (A) A bacterium (B) Plasmid (C) Plasmodium (D) Bacteriophage