(i) 0.4 ÷ 2 = \(\frac{4}{10}\) ÷ 2 = \(\frac{4}{10}\)× \(\frac{1}{2}\)= \(\frac{2}{10}\) = 0.2
(ii) 0.35 ÷ 5 = \(\frac{35}{100}\) ÷ 5 = \(\frac{35}{100}\) × \(\frac{1}{5}\) = \(\frac{7}{100}\)= 0.07
(iii) 2.48 ÷ 4 = \(\frac{248}{100}\) ÷ 4 = \(\frac{248}{100}\) × \(\frac{1}{4}\) = \(\frac{62}{100}\) = 0.62
(iv) 65.4 ÷ 6 = \(\frac{654}{10}\) ÷ 6 = \(\frac{654}{10}\) × \(\frac{1}{6}\)= \(\frac{109}{10}\) = 10.9
(v) 651.2 ÷ 4 = \(\frac{6512}{10}\) × \(\frac{1}{4}\) = \(\frac{1628}{10}\) = 162.8
(vi) 14.49 ÷ 7 = \(\frac{1449}{100}\) ÷ 7 = \(\frac{1449}{100}\) ×\(\frac{1}{7}\) = \(\frac{207}{100}\) = 2.07
(vii) 3.96 ÷ 4 = \(\frac{396}{100}\) ÷ 4 = \(\frac{396}{100}\)× \(\frac{1}{4}\) = \(\frac{99}{100}\) = 0.99
(viii) 0.80 ÷ 5 = \(\frac{80}{100}\) ÷ 5 = \(\frac{80}{100}\) × \(\frac{1}{5}\) = \(\frac{16}{100}\) = 0.16
Match the items given in Column I with one or more items of Column II.
Column I | Column II |
(a) A plane mirror | (i) Used as a magnifying glass. |
(b) A convex mirror | (ii) Can form image of objects spread over a large area. |
(c) A convex lens | (iii) Used by dentists to see enlarged image of teeth. |
(d) A concave mirror | (iv) The image is always inverted and magnified. |
(e) A concave lens | (v) The image is erect and of the same size as the object. |
- | (vi) The image is erect and smaller in size than the object. |