Match the List I with the List II from the combinations shown
`{:((I),"Presbiopia",(A),"Sphero-cylindrical lens",),((II),"Hypermetropia",(B),"Convex lens of proper power may be used close to the eye",),((II),"Astigmatism",(C),"Concave lens of suitable forcal length",),((IV),"Myopia",(D),"Bifocal lens of suitable forcal length",):}`

Match items List - I with those in List - II from the combinations shows : {:("List - I","List - II"),("(I) Saliva","(A) Genetic material"),("(II) Nucleic acid","(B) Digestive enzyme"),("(III) Ascorbic acid","(C ) Antibiotic"),("(IV) Testosterone","(D) Sex hotmone"),(,"(E ) Vitamin"):}

A convex lens of power 2 D and a concave lens of focal length 40cm are kept in contact, find (a) Power of combination , (b) Equivalent focal length

A convex lens of power 2 D and a concave lens of focal length 40cm are kept in contact, find (a) Power of combination , (b) Equivalent focal length

Match List I with List II and select the correct answer using the code given below the Lists : {:(" Lists I Lists II"),(" (Disease) (Remedy)"),("A. Hypermetropia 1. Concave lens"),("B. Presbyopia 2. Bifocal lens"),("C. Myopia 3. Surgery"),("D. Cataract 4. Convex lens"):} Code A B C D

What is the sign of the power of (i) a convex lens (ii) a concave lens ?

Match the items given in A, B, C and D against. their corresponding description given in 1, 2, 3, 4 and 5. A. Astronomical telescope B. Galilean Telescope C. Simple Microscope D. Compound Microscope 1. contains one convex lens 2. contains one concave lens 3. contains a convex lens of large focal length in the objective and a convex lens of small focal length in the eye-piece 4. contains a convex lens of small focal length in the objective and a convex lens of large focal length in the eye-piece 5. contains a convex lens of large focal length in the objective and a concave lens of small focal length in the eye-piece

Which eye defect can be corrected using (i) convex lens and (ii) concave lens ?